EFORE 1MRK002238-DA

Overview

EFORE 1MRK002238-DA, also marked as ABB SR91C830, is a switch-mode power supply module manufactured by EFORE for ABB’s REL500 / RET545 / REG670 protection and control relay platform. This high-reliability power unit supplies stable DC operating power to bay control and protection equipment in substations, widely supplied as exchange spare for substation relay cabinet and switchgear automation overhaul and replacement.

Features

EFORE 1MRK002238-DA accepts wide-range AC input and converts it into regulated isolated 24 VDC output for protection relay, communication board and I/O circuits. It incorporates active power factor correction, low ripple output and robust surge suppression circuits to adapt to harsh power quality conditions inside substation control rooms. EFORE 1MRK002238-DA is equipped with comprehensive built-in protection functions including input overvoltage, undervoltage, output short-circuit, overcurrent and over-temperature shutdown. It supports continuous 24-hour operation and has low standby power consumption. Status LED indicators show power normal, fault and alarm signals for fast on-site inspection. Fault information can be read through the relay’s internal diagnostic system, and it conforms to IEC 61850 and substation EMC immunity requirements. It complies with CE and relevant power industry standards with IP20 protection rating.

Specs

EFORE 1MRK002238-DAPlatform: ABB REL500 / REG670 / RET545 relay system Alternative code: SR91C830 Type: substation grade switch-mode power supply module Input: 85–264 VAC Output: regulated 24 VDC Efficiency: ≥95% Protection: OVP, UVP, OCP, short-circuit, thermal shutdown Operating temperature: -10℃ ~ +50℃ Mounting: plug-in slot mounting inside ABB relay cabinet Enclosure rating: IP20 This is not a protection relay or communication module; it is the dedicated power supply unit for ABB bay control relays. EFORE 1MRK002238-DA is widely supplied as service replacement spare for substation relay power failure.

Principle

EFORE 1MRK002238-DA converts alternating current input into stable DC voltage through rectification, high-frequency switching transformer and secondary regulation circuit. The internal monitoring circuit continuously samples output voltage, current and power component temperature. When abnormal conditions are detected, the power supply immediately shuts down the power stage and triggers a fault signal to the host protection relay. Once the fault is removed, the module can perform automatic recovery according to configuration. Stable DC power output ensures the protection logic, sampling and trip circuits of the relay can respond correctly under grid disturbance scenarios.

Applications

EFORE 1MRK002238-DA is deployed for line protection, transformer protection, feeder bay control and substation automation panels using ABB REG670 and RET545 series relays. It is selected for spare inventory and cabinet retrofit projects for existing ABB substation relay power supply systems.