Brand: ABB
Category: Power Supplies
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for HD4
Uploaded: April 20, 2026, 7:42 p.m.
Warranty Information
Refer to ABB for specific warranty details for your product.
Operating the Circuit-Breaker
The HD4 circuit-breaker can be operated manually or electrically.
Manual Operation:
- Spring Charging: Insert the charging lever into the seat and turn clockwise until the yellow indicator appears. Do not exceed 170 N force.
- Closing: Ensure closing springs are fully charged. Push the closing push button (3).
- Opening: Push the opening push button (2).
Electrical Operation:
- Spring Charging: Achieved automatically by a geared motor, shunt closing release, or shunt opening release (optional accessories).
- Closing: Can be remotely controlled via a control circuit if a shunt closing release is fitted. Indicator (4) shows closing.
- Opening: Can be remotely controlled via a control circuit if a shunt opening release is fitted. Indicator (4) shows opening.
Safety Precautions:
- Always ensure the operating mechanism springs are discharged and the apparatus is in the open position before any operation.
- Handle moving parts with care.
- Do not force mechanical interlocks.
- Racking-in and racking-out operations must be gradual.
Troubleshooting and error codes
| Subject of the Inspection | Procedure | Positive Check |
|---|---|---|
| Insulation resistance | With a 2500 V Megger, measure the insulation resistance between phases and exposed conductive part of the circuit. | The insulation resistance should be at least 50 MΩ and, in any case, constant in time. |
| Auxiliary circuits | With a 500 V Megger (installed equipment permitting) measure the insulation resistance between the auxiliary circuits and the exposed conductive part. Check the connections to the control circuit; proceed with relative supply. | The insulation resistance should be a few MΩ and, in any case, constant in time. Normal switchings and signallings. |
| Manual operating mechanism | Carry out a few closing and opening operations (see chap. 6). N.B. Supply the u/v release and the locking magnet on the operating mechanism at the relative rated voltage (if provided). | The operations and relative signals occur correctly. |
| Motor operator (if provided) | Supply the geared motor for spring charging at the relative rated voltage. | The springs are charged correctly. The signals are correct. The geared motor cuts off when the springs are charged. |
| Undervoltage release (if provided) | Carry out a few closing and opening operations. N.B. Supply the undervoltage release and the locking magnet on the operating mechanism at the relative rated voltage (if provided). | The circuit-breaker closes correctly. The signals are correct. The geared motor recharges the springs after each closing operation. |
| Shunt opening release and additional shunt opening release (if provided) | Close the circuit-breaker. Supply the shunt opening release at the relative rated voltage. | The circuit-breaker opens. The signals are correct. |
| Shunt closing release (if provided) | Open the circuit-breaker. Supply the shunt closing release at the relative rated voltage. | The circuit-breaker opens correctly. The signals are correct. |
| Key lock (if provided) | Open the circuit-breaker. Turn the key and remove it. Attempt the circuit-breaker closing operation. Insert the key again and turn it 90°. Carry out the closing operation. | Neither manual nor electric closing takes place. |
| Locking electromagnet (YL1) (if provided) | With the circuit-breaker open, springs charged and locking electromagnet not supplied, attempt to close the circuit-breaker both manually and electrically. | Closing is not possible. |
| Auxiliary contacts in the operating mechanism | Insert the auxiliary contacts into suitable signalling circuits. Carry out a few closing and opening operations. | Signals occur correctly. |