Broyce Control – B8PM – 3‑Phase Under‑Voltage, Phase‑Loss & Sequence Relay

The Broyce Control B8PM is a 3‑phase monitoring relay designed to safeguard three-phase systems by detecting under-voltage, phase-loss, and phase-sequence errors. DIN-rail mounted on a PF8-S 8-pin base, it features an adjustable trip delay and a SPDT relay output. This unit is discontinued but remains a reliable choice for legacy systems.

Key Features:

• Manufacturer: Broyce Control (UK)  

• Model / MPN: B8PM (variants include B8PM/2, B8PMU)  

• Functions: Monitors under-voltage, phase-loss, and phase-sequence on 3-phase, 3-wire systems  

• Mounting: DIN rail, PF8-S 8-pin socket (supports up to 600 V)  

• Trip Voltage Ranges: User-configurable; e.g., 84–156 V, 154–286 V, 242–450 V, 308–572 V AC  

• Repeat Accuracy: ±0.5%

• Time Delay: Adjustable 0.2–10 s (±5%), plus ~50 ms response time  

• Output: SPDT relay, rated AC1 250 V / 10 A, AC15 250 V / 6 A, DC1 25 V / 10 A  

• Electrical Life: ≥150,000 operations at rated load  

• Dielectric Strength: 2 kV AC (RMS); impulse withstand 4 kV (1.2/50 µs)  

• Housing: Orange flame-retardant UL94-V0 plastic; weight ~130 g  

• Approvals: CE and UL compliant; designed for industrial control applications  

• Operating Environment: –20 °C to +60 °C; humidity up to 95%