Beckwith Electric M‑0245C High Speed Sync‑Check Relay (Mod #22)

The Beckwith Electric M‑0245C is a high‑speed sync‑check relay that provides rapid and accurate verification of synchronism conditions before closing a circuit breaker. It compares voltage magnitude, phase angle, and frequency between two AC sources and issues a close command when all parameters are within adjustable limits. This relay is essential for automatic paralleling of generators and for safe bus transfers in critical power systems.

Model #22 indicates a specific configuration with enhanced voltage matching and dead‑bus closure options. The M‑0245C features a response time of less than 50 ms, ensuring minimal delay in closing operations.

Key Features

• Voltage difference: 80–120% of nominal (adjustable)

• Phase angle window: ±5° to ±20° (adjustable)

• Frequency difference: 0.05–2.0 Hz (adjustable)

• Response time: < 50 ms

• Dead‑bus and live‑bus closure logic

• Output relay with form‑C contacts

• LED status indicators and test point

Technical Specifications

Inputs: 120/240 VAC, 50/60 Hz; burden: < 5 VA; accuracy: ±0.5% voltage, ±0.02 Hz; output: 1 x SPDT, 5 A; operating temperature: -20°C to +65°C; dimensions: 90 x 70 x 40 mm.

Applications

Used in generator paralleling panels, automatic transfer switches (ATS), and network tie‑breakers. Ensures seamless switching without mechanical shock or electrical transients.

Installation and Setting

Mount the relay on a DIN rail or panel. Connect voltage leads from both sources. Adjust settings via potentiometers and DIP switches. A built‑in test button allows functional verification.

Reliability and Maintenance

Solid‑state design ensures long life and minimal maintenance. The relay is immune to vibration and moisture. Periodic checks of setpoints are recommended.

Why Choose the M‑0245C?

This relay offers a high‑speed, reliable solution for sync‑check applications, with the flexibility to match various system requirements. Beckwith Electric’s quality ensures dependable performance.

In summary, the Beckwith Electric M‑0245C provides fast and accurate synchronism verification, enhancing the safety and reliability of power switching operations.