Ceramic Sealed
HV DC Contactors

The definitive switching solution for EV Battery Packs (400V/800V) and Solar ESS (1500V). Featuring a hermetically sealed ceramic chamber for zero arc leakage.

View Product Series Technical Specs

Why Ceramic Brazing?

Unlike epoxy-sealed relays which can rupture under high pressure, our Ceramic Brazing Technology creates a molecular bond between the ceramic chamber and metal terminals.

✔ Hydrogen Filled: The chamber is filled with $H_2$ gas, which has high thermal conductivity to rapidly cool and extinguish arcs.
✔ Zero Oxidation: Contacts operate in an inert environment, ensuring stable resistance (< 0.2mΩ) over 20 years.
✔ Explosion Proof: Designed to withstand short-circuit currents up to 2000A without rupturing.

BMS Application Architecture

How EVM and ESM Series work together in an Electric Vehicle Battery Pack.

Battery Pack

➡

Main + (EVM-250)

Pre-Charge (ESM-40)

➡

Motor Controller

Select Your Series

High Power Main Contactor

EVM Series

Designed for the main battery disconnect. Capable of carrying 300A continuous and breaking 2000A short circuits.

Current 100A – 300A

Voltage 1000V DC

Coil 12V / 24V DC

Life 200,000 Ops

View EVM Models

Compact / Pre-Charge

ESM Series

Compact size for pre-charge circuits and 1500V solar strings. High insulation resistance for auxiliary systems.

Current 20A – 80A

Voltage 1500V DC

Structure Low Noise

Size Compact Cube

View ESM Models

EVM Series Ordering Information

Part Number	Continuous Current	Max Voltage	Coil Voltage	Aux Contact	Connection
EVM-100-12	100 A	1000 V	12 VDC	Optional	M5 Screw
EVM-100-24	100 A	1000 V	24 VDC	Optional	M5 Screw
EVM-200-12	200 A	1000 V	12 VDC	Optional	M6 Screw
EVM-250-12	250 A	1000 V	12 VDC	Optional	M8 Screw
EVM-300-12	300 A	1000 V	12 VDC	Optional	M8 Screw

Dimensions: EVM-300: 80.5 x 65 x 72mm | EVM-100: 68 x 56 x 60mm

ESM Series Ordering Information

Part Number	Continuous Current	Max Voltage	Coil Voltage	Insulation	Feature
ESM-20-12	20 A	1500 V	12 VDC	1000 MΩ	Compact 1500V
ESM-40-12	40 A	1500 V	12 VDC	1000 MΩ	Pre-Charge
ESM-80-12	80 A	1000 V	12 VDC	1000 MΩ	Mid-Power

Dimensions: ESM-20: 42 x 35 x 38mm (Ideal for tight PCB layouts)

Ready for Production?

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Ceramic SealedHV DC Contactors