Technical Specifications Multi‑channel relay dry‑contact output. Drive signal 24‑250 V DC. Relay contact rating 250 V AC / 5 A resistive load. Auxiliary power supply 24‑250 V DC. Typical power consumption 4.4 W. Operating temperature ‑25 ℃ to +70 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Front‑panel IP30, rear connector area IP20. Complies with IEC secondary relay standards.
Functional Features Receives drive signal from protection main unit. Drives multiple independent relay dry‑contact outputs. Realizes signal expansion for alarm, interlock and status indication. Front‑panel LED indicators reflect each relay action state. Built‑in power‑supply monitoring function.
Application Scenarios Mounted in substation protection relay rack. Used for contact quantity expansion of numerical and traditional protection devices. Suitable for old substation renovation and spare‑part replacement.
Performance Parameters Relay mechanical service life reaches 10000000 operations. Signal response maintains millisecond‑level speed. Contact switching capacity satisfies secondary circuit load requirement. Power‑supply abnormality triggers LED alarm prompt.
Material Composition Glass‑fiber epoxy printed circuit board. Electromagnetic relay components, signal drive circuit. Screw‑type wiring terminals. Reinforced plastic module housing.
Structural Characteristics Standard rack‑mount plug‑in module structure. Front panel arranges LED indicator lamps corresponding to each output channel. Rear side matches rack back‑plane plug‑in connector.
Working Principle After power‑on, module completes power‑supply self‑check. Internal drive signal from protection main unit accesses relay drive circuit. When trigger condition is satisfied, corresponding electromagnetic relay pulls‑in, dry‑contact completes signal output for external secondary loop.
Installation Requirements Insert module into standard relay rack slot and tighten locking screw. Connect auxiliary power supply within rated voltage range. Complete external secondary loop wiring strictly according to engineering drawing.
Usage Notes Take anti‑static measures before module operation. Hot‑plug under powered condition is forbidden. Periodically check terminal tightening status and relay contact burning condition. Avoid dust and corrosive gas environment.
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