ABB DA501 1SAP250700R0001Three-Phase Multifunction Voltage Monitoring Relay

ABB DA501 1SAP250700R0001 three-phase multi-functional voltage monitoring relay

Order Number: DA501 1SAP250700R0001
Model Name: CM-MPS.23S
Brand: ABB CM Series Three-phase Multi-functional Voltage Monitoring Relay
Terminal Type: Screw terminals (S version); The same series has no-screw spring terminals model: CM-MPS.23P / 1SVR740885R4300, the two cannot be directly interchanged

Core Parameters
Measurement / Power Supply Voltage (L-N): 180…280 V AC (compatible with 220V line voltage system, three-phase 380/400V power grid)
Applicable Frequency: 50 / 60 / 400 Hz
Output Contacts: 2 groups of switching contacts 2c/o (SPDT)
Settable: 2×1c/o (two independent signals) or 1×2c/o (common fault signal)
Contact Capacity: 250V AC / 4A
Installation Method: 35mm DIN rail installation
Dimensions: Width 22.5mm; Protection: Terminal IP20
Operating Temperature: -20℃ ～ +60℃

Monitoring Functions (All Adjustable Thresholds)
✅ Phase Missing Protection
✅ Phase Sequence Error Monitoring
✅ Three-phase Voltage Unbalance (Asym)
✅ Overvoltage (+U), Undervoltage (-U)
✅ Neutral Wire Break Monitoring
✅ Fault Delay: 0.1～30s adjustable, or instantaneous action
Panel Adjustment Knob
+U: Overvoltage Threshold
-U: Undervoltage Threshold
Asym: Three-phase Unbalance Degree
T: Fault Action Delay
Function DIP Switch: Phase Sequence Input/Output, Output Mode Selection

Typical Applications
Generator sets, water pumps, air compressors, fans, production line three-phase power supply protection; commonly used in UNITROL excitation system matching control cabinets, low-voltage complete equipment power abnormal alarm and shutdown interlock.