Voltage Monitoring Relay - 208-480 V AC Phase Loss + Sequence, 1 C/O is a voltage monitoring relay designed for phase loss and phase sequence monitoring on 3-phase 3-wire supplies. It detects missing phase and incorrect phase order before connected equipment is allowed to run.
🔧 Technical Highlights:
- Supply / Input: 208-480 V AC, 3-phase 3-wire
- Monitoring Type: Phase loss and phase sequence monitoring
- Relay Output: 1 C/O
- Contact Rating: 5 A @ 250 V AC / 30 V DC resistive
- Power Consumption: 3 VA
- Frequency: 50/60 Hz
- Operating Temperature: -15°C to +60°C
- Mounting Width: 17.5 mm
✅ Benefits:
- Makes the monitored supply condition clear at the control-panel level.
- Provides relay output switching for alarms, interlocks or protection circuits.
- Helps maintenance teams identify supply faults before connected equipment is restarted.
- Supports reliable motor, pump and distribution-panel operation.
🚀 Applications:
- Three-phase motor control panels
- Pump, fan and compressor starters
- Industrial distribution and MCC panels
- Machine safety and fault signalling circuits
MK21D5 provides clear voltage monitoring relay performance for dependable panel protection and fault signalling.
FAQs
- Q: What does this voltage monitoring relay monitor?
A: It monitors the specified supply conditions and switches its relay output when the selected fault condition is detected.
- Q: What is the main selection detail for MK21D5?
A: Phase-sequence 208-480 V AC monitoring with phase loss detection and 1 C/O output.