ABB AMVAC Technical Manual page 9

The following are standard features of the AMVAC electronic controller:
• Loss of control power trip
• Trip on declining capacitor voltage
The AMVAC circuit breaker is shipped with these standard features disabled; the end user may enable the features he chooses by moving
the appropriate 'dip' switch to the 'on' position.
The following electronic controller 'dry contact' (250 VAC and VDC, 200 mA) outputs wired to the circuit breaker secondary
disconnects are optional at extra cost:
• A normally open contact that closes when the capacitors are fully charged to provide external 'Ready' indication.
• A normally closed contact that opens when the capacitors are not fully charged to provide external 'Not Ready' indication.
• A normally open contact that closes for 100 ms to indicate a trip signal was received by the microprocessor.
• Two normally open 'a' contacts which close when the circuit breaker is closed plus two normally closed 'b' contacts which open
when the circuit breaker is closed.
• Close blocker function that prevents circuit breaker closing unless a control power signal (16 - 280 VDC, 104 - 256 VAC) is
present at the terminals of the close blocker feature.
The following option allows circuit breaker tripping even when the microprocessor is disabled:
• Auxiliary Trip on failure of control board microprocessor. When turned 'On' by the 'Dip' switch, a trip signal across the
auxiliary trip terminals bypasses the microprocessor to perform tripping. In the 'Off' position, trip signals on the auxiliary trip
terminals will not trip the circuit breaker.
AMVAC. The modern circuit breaker.
AMVAC
The equipment specifications:
• Completely concealed moving parts
• UL Labeling and CSA compliance
• Low Power consumption
• ANSI compliance at 5, 15, and 27 kV
1. Upper Primary Terminal
2. Vacuum Interrupter
3. Epoxy Potting Compound
4. Lower Primary Terminal
5. Flexible Connector
6. Wipe Springs
7. Insulated Pushrod
8. Jackshaft
9. Stroke Adjustment
10. Position Sensors
11. Close Coil
12. Permanent Magnets
13. Armature
14. Open Coil
15. Manual Opening Actuator
16. Mechanism Enclosure
The AMVAC is the first vacuum
circuit breaker to combine low
maintenance embedded vacuum
interrupters, a low maintenance
magnetic actuator, and a
maintenance-free electronic
controller. The result is a
medium voltage circuit breaker
capable of 100,000 operations.
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