Page 73 - 1SBC104119C0202_MainCatalog_R contactors

Alternator field discharge
AM-CC-NOR, AM-CC-JORE and AMF-CC-JORE contactors

Application
Alternator field discharge (or field circuit breakers) are used to control the field winding of
synchronous machines or exciter machines. In case of disturbances, the contactors ensure
a definite disconnection from the supply source and the subsequent discharge of the energy
stored in the machine magnetic circuit via a discharge resistor.

Diagram

Supply

AMF-CC-JORE 800-21

2 poles in series Discharge resistor 5
Field winding
Alternator field
discharge

Description
These contactors are designed with:
–– 2 or 3 N.O. main poles with blowout devices, suitable for 2250 V DC max. operational

voltage and circuit time constant L/R ≤ 15 ms
–– 1 N.C. main pole, without blowout device, named "discharge pole" and set MAKE before

BREAK with regard to the N.O. main poles. For N.C. main pole with breaking capacity,
please consult us.

Electro-magnet
AM-CC-JOR and AMF-CC-JOR alternator field discharge are equipped with a latching device:
–– magnetical latch for R63 ... R200
–– mechanical latch for R550 ... R4500.
AC or DC control circuit.
The AMF-CC-JOR type is equipped with 2 tripping coils (double de-latching control).

Auxiliary contacts
–– AM-CC: 5 auxiliary contacts as standard (3 N.O. + 2 N.C.)
–– AMF-CC: 4 auxiliary contacts as standard (2 N.O. + 2 N.C.)
–– Up to 16 auxiliary contacts max. on request.

1SBC104043S0201 - Rev. A

ABB R contactors | 5/21