EM Devices Corporation

News Releases

Compact, Low Cost, Highest Short-Circuit withstand Performance and Shock Resistance
Now Available as Samples of “ER250”, High-Voltage DC Relay for x EV

EM Devices Corporation (President: Chihiro Yamamoto, Headquarters: Shiroishi City, Miyagi Prefecture) has developed “ER250”, a high-voltage DC relay targeting high-voltage junction boxes for xEV, and will begin providing samples in November 2024.

Product Overview

HVDC Relay 「ER250」

Product Name ER250-***H(* depends on the specifications)
Structure Air-Switching、Plastic Sealed
Contact Rating 250A-450Vdc、Resistive Load
Max. Cut-Off Current 1800A-450Vdc
Contact Type 1 form X
Coil Voltage 12Vdc
Short Circuit Performance 20kA, 5ms
Dielectric Strength 2500Vac, 1min
Shock Resistance ≧1000m/s2  (Actual)
Dimensions
(L x W x H)
55.5 x 42.5 x 61.0 mm
Weight 380g
Start of Mass Production 2025

While xEV are gaining recognition in the market and becoming increasingly popular, they also present challenges. In addition, the cruising range of BEV in particular has become an issue due to insufficient recharging infrastructure, making it necessary to reduce the weight of the vehicle itself. In addition, the safety of EVs, such as fire hazards in the event of a collision, has been attracting attention in recent years.

As a relay manufacturer, we have developed “ER250” as our solution to these EV issues faced by automobile manufacturers.

“ER250” uses a structure that does not use ceramics, which is commonly used in other relays, making it a smaller and lower cost product. In addition, our unique contact structure has achieved the world’s highest short-circuit withstand performance: 20kA*1. Furthermore, by adopting a hinge structure, which is our specialty, we have also achieved the world’s highest shock resistance performance (1000 m/s2 *2) as an automotive high-voltage DC relay.

In the rapidly evolving EV market, EM Devices will continue to quickly capture the latest trends and develop products that meet customer needs.

*1, 2.Based on our research as of September 2024.

Product Datasheet and Contact Information

Please note that the product specifications and service details mentioned in this news release are current as of the announcement date and are subject to change without notice.