Technical Specifications Three‑phase current measurement input, digital input and relay output contacts, communication interface. Built‑in thermal model calculation function. Operating ambient temperature ‑20 ℃ to +65 ℃, storage temperature ‑40 ℃ to +85 ℃, relative humidity 5%‑95% non‑condensing. Panel‑mount installation form. Local display and keypad on front face.
Functional Features Provides comprehensive motor protection functions: overload, locked‑rotor, phase loss, phase unbalance, ground fault, over‑current protection. Executes motor thermal model calculation. Measures three‑phase current value. Supports motor start‑up supervision. Stores fault event records and historical running data. Realizes remote monitoring and parameter setting through communication interface. Local keypad and display support on‑site configuration and status checking.
Application Scenarios Motor protection and monitoring device for pumps, fans, compressors and conveyors. Widely used in power plant auxiliary system, petrochemical industry, water treatment and manufacturing motor control centers.
Performance Parameters High‑precision current measurement accuracy, fast protection trip response, complete fault event recording capability, stable long‑term continuous operation performance.
Material Composition Flame‑retardant plastic housing. Main processing circuit board, current signal conditioning circuit, relay contact output assemblies. Front‑panel LCD display and operation keypad. Screw‑type wiring terminals for field signal connection.
Structural Characteristics Standard panel‑mount rectangular housing. Front panel contains display screen and setting keypad. Rear side arranges multi‑group screw wiring terminals for current input, digital I/O and communication connection. Pre‑designed panel mounting fixing clips for cabinet door installation.
Working Principle Current transformers feed motor current signals into relay input terminals. Running data and fault information can be read locally or uploaded to upper monitoring system.
Installation Requirements Power on device, configure motor rated parameters and protection threshold settings, verify protection logic function.
Usage Notes CT secondary circuit must never be open‑circuited. Protection threshold parameters must match actual motor nameplate data. Keep relay environment free from excessive dust and moisture.
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