JCZ7-12 AC Contactor Medium Voltage 3 Phase Vacuum Contactor

JCZ7（G）12kV 400A Vacuum ContactorJCZ7-12 series AC Vacuum Contactor 3 polesis suitable for the AC electric system, of which the frequency is 50~60 Hz, rated working voltage of 12 kV (or 7.2 kV), for direct or remote on-off control of the main circuits.This series of vacuum contactors main used below the rated current from 160A-630A power network systems for remote making and breaking and frequent starting and control of AC motors, transformers and capacitor banks and other occasions.NameUnitValueMain circuitRated working voltage (Ue)kV12Rated working current (Ie)A400,630Rated frequency (fr)H...

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JCZ7（G）12kV 400A Vacuum Contactor

JCZ7-12 series AC Vacuum Contactor 3 polesis suitable for the AC electric system, of which the frequency is 50~60 Hz, rated working voltage of 12 kV (or 7.2 kV), for direct or remote on-off control of the main circuits.

This series of vacuum contactors main used below the rated current from 160A-630A power network systems for remote making and breaking and frequent starting and control of AC motors, transformers and capacitor banks and other occasions.

Name			Unit	Value
Main circuit	Rated working voltage (Ue)		kV	12
	Rated working current (Ie)		A	400,630
	Rated frequency (fr)		Hz	50
	Rated making capacity		A	10Ie (AC-4)
	Rated breaking capacity		A	8Ie (AC-4)
	Rated short time withstand current		A	10Ie
	Rated peak withstand current		A	25Ie
	Rated short circuit duration		s	4
	Power frequency withstand voltage	Wiring terminal to earth	kV	42
		Vacuum breaks	kV	42
	Lightening impulse withstand voltage		kV	75
Control circuit	Rated voltage (Us)		V	AC or DC. 110/220
	Rated power (Ps) electric holding		VA	≤1000/100(absorbing/holding)
Auxiliary circuit		Form		3a+2b
		Rated value		AC 380V/5A, DC 380V/1A
Control circuit, auxiliary circuit to earth power frequency withstand voltage			kV	2
Rated operating frequency	Long-term		time/h	300
	Short-term		time/h	600
Mechanical endurance			10000 times	30
Electrical endurance			10000 times	10
Mechanical characteristics	Closing time		ms	≤200
	Original opening time		ms	≤160
	3-phase synchronism		ms	≤3
	Closing tripping		ms	≤15
Net weight			kg	49.5

Reliable & High-Capacity JCZ7-12 AC Contactor for Medium Voltage Applications

Designed for industrial and utility-grade performance, the JCZ7-12 AC contactor medium voltage 3 phase vacuum contactor delivers exceptional switching reliability in 12kV Power Systems operating at 50–60 Hz. With rated currents of **400A or 630A**, it’s engineered for frequent remote control of motors, transformers, capacitor banks, and other high-demand loads—making it a cornerstone of modern medium-voltage motor control centers.

This robust vacuum contactor features hermetically sealed interrupters that eliminate arc formation during operation, ensuring long electrical life and minimal maintenance. It supports a **rated making capacity of 10×Ie** and **breaking capacity of 8×Ie (AC-4 duty)**, withstanding short-circuit currents up to **25×Ie peak** for 4 seconds—ideal for harsh industrial environments where system stability is critical.

Key technical strengths of the 12kV 3-phase vacuum contactor include:

Power frequency withstand voltage of **42 kV** (phase-to-earth and across contacts)
Lightning impulse withstand up to **75 kV**, enhancing resilience in outdoor-connected substations
High-speed operation: closing ≤200 ms, opening ≤160 ms, with ≤3 ms 3-phase synchronism
Flexible control options: AC/DC 110V or 220V coil, low holding power (≤100 VA)
Mechanical endurance of **1 million operations** and electrical life of **100,000 cycles** under load

As shown in the image above, the JCZ7-12’s compact yet rugged enclosure integrates seamlessly into switchgear panels while maintaining excellent thermal and dielectric performance. Whether deployed in mining facilities, water treatment plants, or renewable energy substations, this medium voltage vacuum contactor for industrial use ensures safe, efficient, and code-compliant control of critical electrical infrastructure—backed by precision engineering and global safety standards.