Beckwith M‑0170A AC Current Relay

The Beckwith M‑0170A is a solid‑state AC current relay designed for precise monitoring of current levels in power circuits. It provides adjustable overcurrent and undercurrent detection, making it suitable for protection, alarm, and control applications in industrial and utility systems. The relay senses the AC current from a standard CT and trips when the measured value exceeds or falls below a preset threshold.

This relay features a compact enclosure, easy front‑panel adjustments, and a high‑accuracy measuring circuit. Its fast response time ensures timely detection of current anomalies, preventing equipment damage and process interruptions.

Key Features

• Adjustable pickup range: 0.5–5 A (secondary)

• Overcurrent and undercurrent detection modes

• Adjustable time delay: 0.1–10 s

• High accuracy: ±2% of setting

• Output relay with form‑C contacts

• LED indication for trip status

• DIN‑rail or panel mounting

Technical Specifications

Input: 1A or 5A CT secondary; burden: < 0.5 VA; frequency: 50/60 Hz; output contacts: 1 x SPDT, 5 A; power supply: 120/240 VAC or 125 VDC; operating temperature: -20°C to +60°C.

Applications

Used for motor overload protection, feeder monitoring, pump control, and conveyor belt protection. The relay is also employed in capacitor bank protection and load shedding schemes.

Installation and Adjustment

Mount the relay on a DIN rail or panel. Connect the CT leads and the output wiring. Set the pickup current and time delay using the front‑panel potentiometers. A test button is provided for functional verification.

Reliability and Maintenance

Solid‑state construction ensures long life with no moving parts. The relay is protected against surges and transients. Periodic checks of calibration are recommended.

Why Choose the M‑0170A?

This relay offers a simple and cost‑effective solution for AC current monitoring, backed by Beckwith Electric’s reliability. Its versatility makes it suitable for a wide range of applications.

In summary, the Beckwith M‑0170A provides accurate and dependable current protection for AC power systems.