Celduc Relais Introduced SMI High-Voltage DC Relays
The new series of solid-state relays offers specialized protection and switching capabilities for railway applications.
Updated on Oct. 12, 2026 in Semiconductors
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Celduc relais has developed the SMI Series of high-voltage DC solid-state relays designed specifically for the railway industry. These devices improve system reliability by replacing mechanical contacts with semiconductor technology.
Why it matters
The removal of mechanical contacts significantly reduces maintenance requirements in demanding electrical railway environments. The relays also incorporate advanced diagnostic and protection features to improve operational safety.
The SMI Series supports a maximum switching current of 15 A and handles loads up to 750 VDC within a 45 mm wide installation footprint. The device features an active-clamp function to manage overvoltage and a semiconductor breakdown threshold of 1700 V.
The players
Celduc relais
This company is a global manufacturer specializing in solid-state relays and magnetic sensors for industrial and transport applications.
The details
The relays use power semiconductor technology to achieve microsecond-speed shutdowns when detecting short-circuits. Additional features include under-voltage lock-out protection, real-time status diagnostics, and push-in spring-type connectors for power cabling.
Timeline
October 12, 2026: Celduc relais published the official product announcement.
The Tech Race
This release follows the ongoing industry transition from mechanical relay switching systems to electronic alternatives to decrease physical wear. It positions Celduc relais to compete against providers of traditional electromechanical hardware by offering longer-lasting, diagnostic-capable solid-state solutions.
Railway manufacturers can now integrate compact 45 mm units that feature automated protection against short-circuits and under-voltage events. The use of push-in spring-type connectors simplifies installation and maintenance procedures for technical teams in the field.
The takeaway
The implementation of solid-state relays in transit infrastructure allows for more robust diagnostic monitoring and significantly longer service lives compared to mechanical switches. Engineering teams should prioritize the integration of real-time status output features to preemptively identify system faults.
Further reading
For more information on current developments in the power component market, see Semiconductors.
Source note: This article includes information reported by Railway-News.
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