Technical Specifications Monitoring Voltage Range: adjustable AC‑DC measuring range Supply Mode: self‑powered from monitored measuring circuit Output Contact: 1 change‑over relay contact Contact Switching Capacity: 8 A 250 VAC resistive load Response Time: configurable delay time for fault detection Mounting: 35 mm DIN‑rail mounting Protection Class: IP20 Operating Temperature: ‑20 ℃ to +60 ℃
Functional Features Self‑powered design without separate auxiliary power supply. Adjustable over‑voltage and under‑voltage threshold setting. Fault response time delay suppresses transient voltage disturbance. Relay change‑over contact for alarm and interlock signal output. Front‑panel LED indicates measuring and fault status.
Application Scenarios Control power supply voltage monitoring for industrial automation cabinet. Voltage fault alarm for pump and fan motor control loop. Auxiliary power supervision for small‑scale power distribution cabinet. Voltage protection for unattended on‑site control equipment.
Performance Parameters Voltage detection threshold keeps stable under long‑term running. Time‑delay filtering function avoids mis‑operation from transient voltage spike. Output contact reliable switching for secondary control signal loop.
Material Composition Flame‑retardant plastic housing. Voltage sampling and comparison printed circuit board. Electromechanical relay component. DIN‑rail metal spring clip.
Structural Features Compact DIN‑rail modular form factor. Front‑panel adjusting knobs for threshold and delay setting. Status LED indicators arranged on front face. Screw terminals for measured voltage input and signal output.
Working Principle Measured voltage connects to sampling terminal of relay. Internal circuit compares real‑time measured value with preset threshold. When voltage exceeds setting range and holds longer than delay time, output relay changes contact state.
Installation Requirements Mount unit on 35 mm DIN‑rail inside electrical cabinet. Wire measured voltage source strictly follow terminal definition. Complete threshold and delay parameter setting before commissioning.
Usage Notes Measured voltage shall stay within device rated measuring scope. Do not exceed rated switching load of output relay contact. Verify alarm action function during regular equipment inspection.
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