? Description:

The ABB Auxiliary Contact Block for MMS-450 (typically model HKS4-11) is a robust and compact module that attaches easily to the MS450 manual motor starters. It provides additional auxiliary contacts (1 Normally Open + 1 Normally Closed) to signal the operating status of the motor starter (ON/OFF/TRIP) to external control circuits or monitoring devices.

?️ Application:

This accessory is used in motor control systems, industrial automation panels, and protection circuits to provide remote status indication, enable interlocking logic, and support automation through programmable logic controllers (PLC).

? Objective:

To extend the control and monitoring capabilities of the MMS-450 motor starter by offering reliable auxiliary switching for use in signaling, interlocking, or automation applications.

✅ Key Features:

• Contact Configuration:
  – 1 NO + 1 NC (standard version HKS4-11)
  – Other variants available (2 NO or 2 NC)

• Mounting Type:
  – Side mounting (snap-on type, no tools required)
  – Front mounting versions also available (HK4 series)

• Electrical Ratings:
  – Voltage: Up to 690 V AC
  – Current: Up to 6 A (AC-15 utilization category)

• Mechanical Durability:
  – ≥ 100,000 operations

• Safety & Compliance:
  – IP20 finger-safe terminals
  – Complies with IEC 60947-5-1
  – CE, UL, and CSA certified

• Wiring:
  – Screw terminal connection
  – Clear marking for easy identification