{"id":24646,"date":"2023-12-28T12:45:17","date_gmt":"2023-12-28T11:45:17","guid":{"rendered":"https:\/\/efa-controls.com\/?page_id=24646"},"modified":"2025-05-15T14:55:52","modified_gmt":"2025-05-15T12:55:52","slug":"contactors-and-power-relays","status":"publish","type":"page","link":"https:\/\/efa-controls.com\/en\/our-solutions\/electrification\/contactors-and-power-relays\/","title":{"rendered":"Contactors and power relays"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; max_width=&#8221;100%&#8221; max_height=&#8221;747px&#8221; custom_margin=&#8221;0px||0px||true|false&#8221; custom_padding=&#8221;0px||0px||true|false&#8221; border_color_all=&#8221;RGBA(255,255,255,0)&#8221; border_style_all=&#8221;none&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; width=&#8221;100%&#8221; max_width=&#8221;2560px&#8221; custom_padding=&#8221;0px|||||&#8221; border_color_all=&#8221;RGBA(255,255,255,0)&#8221; border_style_all=&#8221;none&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.17.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;Texte&#8221; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;||||||||&#8221; text_text_color=&#8221;#585858&#8243; header_font_size=&#8221;70px&#8221; background_color=&#8221;RGBA(255,255,255,0)&#8221; background_image=&#8221;https:\/\/efa-controls.com\/wp-content\/uploads\/2023\/11\/Slider2-contacteurs-efa.jpg&#8221; background_enable_image=&#8221;on&#8221; background_position=&#8221;bottom_left&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;150px|123px|150px|123px|true|false&#8221; custom_padding_tablet=&#8221;150px|123px|150px|123px|true|false&#8221; custom_padding_phone=&#8221;50px|23px|50px|23px|true|true&#8221; custom_padding_last_edited=&#8221;on|phone&#8221; header_font_size_tablet=&#8221;70px&#8221; header_font_size_phone=&#8221;45px&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; background_last_edited=&#8221;on|phone&#8221; background_image_phone=&#8221;https:\/\/efa-controls.com\/wp-content\/uploads\/2022\/10\/d-koi-GQJY4UPR21U-unsplash-scaled.jpg&#8221; background_enable_image_phone=&#8221;on&#8221; border_color_all=&#8221;RGBA(255,255,255,0)&#8221; border_style_all=&#8221;none&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1><span style=\"color: #333333;\"><strong>Power <\/strong><\/span><\/h1>\n<h1><span style=\"color: #333333;\"><strong>contactors<\/strong><\/span><\/h1>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; disabled_on=&#8221;off|off|off&#8221; admin_label=&#8221;Section&#8221; _builder_version=&#8221;4.18.0&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; custom_margin=&#8221;0px||0px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.18.0&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||0px||true|false&#8221; custom_padding=&#8221;0px||0px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.17.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_icon font_icon=&#8221;&#xf103;||fa||900&#8243; icon_color=&#8221;#0C71C3&#8243; icon_width=&#8221;131px&#8221; _builder_version=&#8221;4.17.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;-120px||||false|false&#8221; animation_style=&#8221;bounce&#8221; animation_direction=&#8221;top&#8221; custom_css_icon_element=&#8221;opacity: 0.5;&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_icon][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.18.1&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;0px||0px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.18.1&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||0px|||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.18.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][lwp_divi_breadcrumbs _builder_version=&#8221;4.18.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][\/lwp_divi_breadcrumbs][et_pb_text _builder_version=&#8221;4.18.0&#8243; _module_preset=&#8221;default&#8221; header_text_color=&#8221;#555555&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<blockquote>\n<h2><span style=\"color: #555555;\"><strong>What is a power contactor ?<\/strong><\/span><\/h2>\n<\/blockquote>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; specialty=&#8221;on&#8221; prev_background_color=&#8221;#ffffff&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#efefef&#8221; top_divider_style=&#8221;mountains2&#8243; bottom_divider_style=&#8221;mountains2&#8243; bottom_divider_color=&#8221;#FFFFFF&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;1_2&#8243; specialty_columns=&#8221;2&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_row_inner custom_padding_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.18.0&#8243; _module_preset=&#8221;default&#8221; custom_padding_tablet=&#8221;&#8221; custom_padding_phone=&#8221;0px||0px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner saved_specialty_column_type=&#8221;1_2&#8243; _builder_version=&#8221;4.17.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; header_2_text_color=&#8221;#474747&#8243; z_index=&#8221;2&#8243; custom_padding=&#8221;24px||||false|false&#8221; border_color_all=&#8221;RGBA(255,255,255,0)&#8221; border_width_bottom=&#8221;2px&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Power contactors are essential components in the <a href=\"https:\/\/efa-controls.com\/en\/our-solutions\/electrification\/electric-powertrain\/\" target=\"_blank\" rel=\"noopener\"><strong>electrification of mobile machinery<\/strong><\/a> and, more generally, in electro-mechanical power systems. They are used for two purposes :<\/p>\n<ul>\n<li><strong>Connection of the precharge circuit<\/strong> : In electrical systems, many capacitors become charged when the machine is switched on or when the power supply to certain blocks in the overall system is initialised. These discharged capacitors will create high current demands which will require a specific circuit and management: a precharge circuit. During this precharging stage, the contactor must be sized so that the peak currents and their duration are known.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Connecting and disconnecting machine loads<\/strong> : Energy-consuming loads can be of 3 types: resistive, capacitive or inductive. Depending on this first parameter, as well as their voltages, consumption current and use, the efa France design office will choose the most suitable solutions.<\/li>\n<\/ul>\n<p>[\/et_pb_text][\/et_pb_column_inner][\/et_pb_row_inner][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_image src=&#8221;https:\/\/efa-controls.com\/wp-content\/uploads\/2023\/09\/Contacteur-rinconpower.png&#8221; alt=&#8221;Rincon Power contactor&#8221; title_text=&#8221;Contacteur-rinconpower&#8221; force_fullwidth=&#8221;on&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; overflow-x=&#8221;hidden&#8221; overflow-y=&#8221;hidden&#8221; custom_padding=&#8221;|||3px||&#8221; animation_style=&#8221;zoom&#8221; hover_enabled=&#8221;0&#8243; custom_css_after=&#8221;content :;||position:absolute;||top:50%;||left:50%;||transform:translate(-50%,-50%);||font-size:15px;||line-height:30px;||text-align:center;||font-weight:bold;||color:white;||width:45%;||background:#00000080;||padding:350px;||opacity:0;||transition-duration: .75s;||pointer-events:none;&#8221; global_colors_info=&#8221;{}&#8221; custom_css_after__hover_enabled=&#8221;on|hover&#8221; custom_css_after__hover=&#8221;opacity:1;&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_image][\/et_pb_column][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;-37px||||false|false&#8221; custom_padding=&#8221;18px||||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_module=&#8221;31999&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][dsm_button button_one_text=&#8221;Technical documentation request &#8211; Electrification range&#8221; button_one_url=&#8221;https:\/\/a97e57e7.sibforms.com\/serve\/MUIFAH0EBNjTpVQekE1F-qMs_303872H9VmJdnF_UPU8TL2Me7waKXBIp_pgV1S9lxDBOPrdQz5Yo09w-r37gJa6HykDXZbxdBRylGqZonafHeI2QNb0Sv4cqWleFOTNP6sXzBNFxaF6CbcyKk3YkZlbiDgNc6OvE4UY04VUth08FfesM3iQ9mb96e32IP-Z4GtKp4yEo6oo8nTT&#8221; button_alignment=&#8221;center&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; tooltip_one_font=&#8221;||||||||&#8221; custom_button_one=&#8221;on&#8221; button_one_text_color=&#8221;#FFFFFF&#8221; button_one_bg_color=&#8221;#e35210&#8243; button_one_border_radius=&#8221;20px&#8221; button_one_font=&#8221;|600|||||||&#8221; button_one_icon=&#8221;&#x35;||divi||400&#8243; global_colors_info=&#8221;{}&#8221;][\/dsm_button][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; fullwidth=&#8221;on&#8221; _builder_version=&#8221;4.19.2&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;35px||35px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_fullwidth_image src=&#8221;https:\/\/efa-controls.com\/wp-content\/uploads\/2023\/09\/Mapping-contacteurs.png&#8221; title_text=&#8221;Contactor mapping&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; width=&#8221;58%&#8221; module_alignment=&#8221;center&#8221; animation_style=&#8221;zoom&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_fullwidth_image][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.18.0&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; min_height=&#8221;102px&#8221; custom_margin=&#8221;-4px||-4px||true|false&#8221; custom_padding=&#8221;0px||0px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row custom_padding_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.18.0&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||0px|||&#8221; custom_padding_tablet=&#8221;&#8221; custom_padding_phone=&#8221;0px||0px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.17.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.23&#8243; _module_preset=&#8221;default&#8221; header_text_color=&#8221;#555555&#8243; global_colors_info=&#8221;{}&#8221;]<\/p>\n<blockquote>\n<h2><span style=\"color: #555555;\"><strong>How to select a contactor?<br \/><\/strong><\/span><\/h2>\n<\/blockquote>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; inner_shadow=&#8221;on&#8221; specialty=&#8221;on&#8221; prev_background_color=&#8221;#FFFFFF&#8221; next_background_color=&#8221;#ffffff&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#efefef&#8221; width=&#8221;100%&#8221; inner_width=&#8221;80%&#8221; inner_max_width=&#8221;2560px&#8221; min_height=&#8221;963.7px&#8221; max_height=&#8221;963px&#8221; top_divider_style=&#8221;mountains2&#8243; bottom_divider_style=&#8221;mountains2&#8243; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;1_2&#8243; specialty_columns=&#8221;2&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_row_inner _builder_version=&#8221;4.17.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column_inner saved_specialty_column_type=&#8221;1_2&#8243; _builder_version=&#8221;4.17.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_accordion toggle_icon=&#8221;&#x43;||divi||400&#8243; icon_color=&#8221;#f9b741&#8243; use_icon_font_size=&#8221;on&#8221; icon_font_size=&#8221;22px&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; toggle_font_size=&#8221;19px&#8221; background_color=&#8221;#1f68b1&#8243; module_alignment=&#8221;left&#8221; border_color_all=&#8221;RGBA(255,255,255,0)&#8221; box_shadow_style=&#8221;preset2&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_accordion_item title=&#8221;1 \/\/ The cut-off current&#8221; open=&#8221;on&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]The breaking current of a power contactor is the maximum value of the electrical current it can safely interrupt. This parameter is essential for choosing a contactor suitable for the electrical load you plan to control, ensuring that it can handle the current safely without risk of overheating or electrical arcing. This current is specified as a peak or rated value. To optimise product sizing, you need to know the current curves.<br \/>\n[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;2 \/\/ Switching voltage&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; open=&#8221;off&#8221;]The breaking voltage of a power contactor is the maximum voltage it can effectively interrupt. It is crucial to select a contactor with an appropriate cut-off voltage for your application, as too high a voltage could cause dangerous arcing or damage the contactor.<br \/>\n[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;3 \/\/ Control voltage&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; open=&#8221;off&#8221;]The coil control voltage is the voltage required to activate the contactor and close or open the main contacts. It must be compatible with the control source, such as a manual override or automatic control circuit. It is important to select the correct coil voltage to ensure correct operation of the contactor. Above the voltage value, some contactors are PWM controlled while others are DC voltage controlled.<br \/>\n[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;4 \/\/ Auxiliary outputs&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; open=&#8221;off&#8221;]The auxiliary outputs of a power contactor are additional contacts used for signalling or control functions. These outputs are used to control other devices or to provide information on the status of the contactor. They are useful for monitoring and diagnosing electrical circuits.<br \/>\n[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;5 \/\/ Mechanical fastening&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; open=&#8221;off&#8221;]The mechanical fixing of a power contactor refers to the way in which it is mounted or secured in the electrical installation. It can vary depending on the model of contactor, with options such as DIN rails, fixing screws or other mechanisms. The choice of mechanical fixing depends on the location and configuration of the electrical installation where the contactor will be installed.<br \/>\n[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;6 \/\/ Performance derating as a function of the number of cycles&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; open=&#8221;off&#8221;]After a large number of cycles, the contactor&#8217;s performance will decrease. The permissible currents and voltages will deteriorate. This is due to the ageing of the metal parts used for electrical contact. Over time, line resistances will become stronger and may lead to overheating.<br \/>\n[\/et_pb_accordion_item][\/et_pb_accordion][\/et_pb_column_inner][\/et_pb_row_inner][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.16&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_slider show_pagination=&#8221;off&#8221; use_bg_overlay=&#8221;on&#8221; bg_overlay_color=&#8221;#FFFFFF&#8221; use_text_overlay=&#8221;off&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;ee79717d-987b-4caf-b3eb-c647c576a0de&#8221; header_font=&#8221;|700|||||||&#8221; background_color=&#8221;#FFFFFF&#8221; width=&#8221;100%&#8221; height=&#8221;741px&#8221; max_height=&#8221;850px&#8221; custom_margin=&#8221;0px||0px||true|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; custom_padding_tablet=&#8221;33px||59px||false|false&#8221; custom_padding_phone=&#8221;20px|5px|20px|5px|true|true&#8221; custom_padding_last_edited=&#8221;on|phone&#8221; hover_transition_duration=&#8221;400ms&#8221; header_text_align_tablet=&#8221;&#8221; header_text_align_phone=&#8221;center&#8221; header_text_align_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221; transform_styles__hover_enabled=&#8221;on|hover&#8221; transform_scale__hover_enabled=&#8221;on|hover&#8221; transform_translate__hover_enabled=&#8221;on|desktop&#8221; transform_rotate__hover_enabled=&#8221;on|desktop&#8221; transform_skew__hover_enabled=&#8221;on|desktop&#8221; transform_origin__hover_enabled=&#8221;on|desktop&#8221;][et_pb_slide heading=&#8221;HVBD series&#8221; image=&#8221;https:\/\/efa-controls.com\/wp-content\/uploads\/2023\/09\/HVBD-series.png&#8221; arrows_custom_color=&#8221;#0a0a0a&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; background_layout=&#8221;light&#8221; width=&#8221;92%&#8221; custom_padding=&#8221;42px||42px||false|false&#8221; global_colors_info=&#8221;{}&#8221; transform_styles__hover_enabled=&#8221;on|desktop&#8221; transform_scale__hover_enabled=&#8221;on|desktop&#8221; transform_translate__hover_enabled=&#8221;on|desktop&#8221; transform_rotate__hover_enabled=&#8221;on|desktop&#8221; transform_skew__hover_enabled=&#8221;on|desktop&#8221; transform_origin__hover_enabled=&#8221;on|desktop&#8221; sticky_transition=&#8221;on&#8221;]Rincon Power high voltage high current circuit breakers<br \/>\n[\/et_pb_slide][et_pb_slide heading=&#8221;Megatactor&#8221; image=&#8221;https:\/\/efa-controls.com\/wp-content\/uploads\/2023\/09\/Megatactor-1000A.png&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; background_layout=&#8221;light&#8221; width=&#8221;86%&#8221; custom_padding=&#8221;43px||43px||true|false&#8221; global_colors_info=&#8221;{}&#8221; sticky_transition=&#8221;on&#8221;]Very high current very high voltage power contactor<br \/>\n[\/et_pb_slide][et_pb_slide heading=&#8221;Hongfa power relay&#8221; image=&#8221;https:\/\/efa-controls.com\/wp-content\/uploads\/2023\/09\/HF-series-Hongfa.png&#8221; _builder_version=&#8221;4.22.2&#8243; _module_preset=&#8221;default&#8221; background_layout=&#8221;light&#8221; width=&#8221;86%&#8221; custom_padding=&#8221;42px||42px||true|false&#8221; global_colors_info=&#8221;{}&#8221; sticky_transition=&#8221;on&#8221;]With its roots in the automotive industry, the Hongfa range offers a wealth of low-voltage solutions. For PCB or bolted applications, a solution for every problem<br \/>\n[\/et_pb_slide][\/et_pb_slider][\/et_pb_column][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; min_height=&#8221;21px&#8221; custom_margin=&#8221;-48px||-48px||true|false&#8221; custom_margin_tablet=&#8221;||50px||false|false&#8221; custom_margin_phone=&#8221;0px||0px||true|false&#8221; custom_margin_last_edited=&#8221;on|phone&#8221; custom_padding=&#8221;0px||0px||true|false&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Power contactors &nbsp;<div class=\"et_pb_module lwp_divi_breadcrumbs lwp_divi_breadcrumbs_0\">\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t<div class=\"et_pb_module_inner\">\n\t\t\t\t\t<div class=\"lwp-breadcrumbs\"> <span class=\"before\"><\/span> <span vocab=\"https:\/\/schema.org\/\" typeof=\"BreadcrumbList\"><span property=\"itemListElement\" typeof=\"ListItem\"><a property=\"item\" typeof=\"WebPage\" href=\"https:\/\/efa-controls.com\/en\/\" class=\"home\"><span property=\"name\">Home<\/span><\/a><meta property=\"position\" content=\"1\"><\/span> <span class=\"separator et-pb-icon\">9<\/span> <\/span><\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div> What is a power contactor ? Power contactors are essential components in the electrification of mobile machinery and, more generally, in electro-mechanical power systems. They are used for two purposes : Connection of the precharge circuit : In electrical systems, many capacitors become charged when the machine is switched [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"parent":20926,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"class_list":["post-24646","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Contactors and power relays - efa Controls<\/title>\n<meta name=\"description\" content=\"efa - Distribution of power contactors for the electrification of mobile machinery and electro-mechanical power systems\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/efa-controls.com\/en\/our-solutions\/electrification\/contactors-and-power-relays\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contactors and power relays - 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