Description
Technical Specifications: Rated voltage 300V AC/DC, continuous rated current 20A, 14 pairs of contacts, insulation resistance ≥100MΩ at 500V DC, operating temperature -25℃ to +55℃, compliant with IEC 60255 standard.
Functional Features: Make-before-break safety contact structure, built-in CT shorting link to avoid CT open circuit overvoltage during testing, convenient circuit isolation, finger-safe design.
Application Scenarios: Power substation protection panels, power plant relay protection secondary circuits, electrical protection maintenance and commissioning, medium voltage switchgear systems.
Performance Parameters: Stable contact resistance, high dielectric strength, >500 insertion operation life, reliable short-circuit protection for CT circuits.
Material Composition: High-performance flame-retardant insulating base, copper alloy silver-plated contacts, metal fixing frame, molded phenolic housing.
Structural Features: Flush panel mounting structure, modular contact units, matching MMLB01 multi-finger test plug interface, front cover with safety interlock probe.
Working Principle: When test plug is inserted, CT secondary circuit is shorted in advance, then original circuit is disconnected, allowing technicians to perform relay testing without removing field wiring.
Installation Requirements: Embedded panel installation, fixed by mounting screws, connect secondary circuit wiring strictly according to terminal identification and wiring diagram.
Notes for Use: Operate strictly following power safety procedures; check contact condition regularly; do not exceed rated voltage and current; ensure test plug is fully inserted before testing.
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