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

The Beckwith M‑0245C is a high‑speed sync‑check relay engineered for rapid and precise verification of synchronism conditions between two AC power sources. This relay is indispensable for automatic generator paralleling, bus transfer applications, and network tie‑breaker closure, ensuring that the voltage magnitude, phase angle, and frequency differences are within safe limits before issuing a close command. The Mod 22 configuration provides enhanced voltage matching and adaptable dead‑bus closure logic.

With a response time of less than 50 milliseconds, the M‑0245C minimizes the risk of out‑of‑phase switching, which can cause severe mechanical stress and electrical transients. Its solid‑state design offers high immunity to noise and transients, making it reliable in industrial and utility environments.

Key Features

• Adjustable voltage window: 80% to 120% of nominal voltage

• Phase angle adjustable from ±5° to ±20°

• Frequency difference adjustable from 0.05 Hz to 2.0 Hz

• Ultra‑fast operation: < 50 ms typical

• Dead‑bus and live‑bus closure capability with selectable logic

• Independent output relay (SPDT, 5 A) for breaker close signal

• Front‑panel LED indicators for power, match, and close status

• Built‑in test button for functional verification

Technical Specifications

Voltage sensing inputs: 120/240 VAC, 50/60 Hz; burden: < 5 VA per input; accuracy: ±0.5% for voltage, ±0.02 Hz for frequency; output contact rating: 5 A at 250 VAC (resistive); operating temperature: -20°C to +65°C; humidity: up to 95% non‑condensing; enclosure: compact case for DIN‑rail or panel mounting.

Applications

This relay is commonly deployed in generator paralleling switchgear, automatic transfer switches (ATS) for critical loads, and in synchronising two independent utility feeders. It is also used in marine and offshore power systems where fast and reliable synchronisation is mandatory.

Installation and Adjustment

Mount the relay securely on a 35 mm DIN rail or using screws. Connect the two voltage sensing leads (source 1 and source 2) to the appropriate terminals. Adjust the voltage, phase angle, and frequency setpoints via the front‑panel potentiometers. The DIP switches allow configuration of dead‑bus mode and output relay behaviour. A test push‑button facilitates simulation of matching conditions for commissioning.

Reliability and Maintenance

The M‑0245C is built with high‑grade components and features transient suppression to protect against surge voltages. Its fully solid‑state construction ensures an exceptionally long service life with no moving parts. Periodic checks of setpoints and visual inspection of connections are recommended to maintain optimal performance.

Why Choose the M‑0245C?

This relay combines speed, accuracy, and flexibility at a competitive cost, making it a preferred choice for engineers requiring dependable sync‑check protection. Beckwith Electric’s proven design and rigorous factory testing guarantee consistent operation even in demanding power system environments.

In summary, the Beckwith M‑0245C Mod 22 high‑speed sync‑check relay delivers rapid and precise synchronism verification, ensuring safe and seamless switching between AC sources, thereby protecting equipment and enhancing system stability.