Construction - ABB AMVAC Technical Manual

AMVAC breaker

Construction

Magnetic actuator
Introduced in 1997, the bi-stable magnetic actuator is used in
many ABB products, including the AMVAC breaker. Due to its
simple design, no maintenance on the actuator is necessary for
the lifetime of the product.
The magnetic actuator operates on the principle of shifting
magnetic flux and is latched into one of the stable positions by
rare-earth magnets which require no power.
Vacuum interrupters
ABB vacuum interrupters (VIs) are embedded in a solid insula-
tion material to protect the VIs from collecting dust or moisture
and from accidental bumps. The solid insulation also improves
tracking resistance making ABB circuit breakers some of the
lightest available in the market. Because of the embedded
design, these vacuum interrupters are maintenance-free for the
life of the VI.
1 Magnetic actuator | 2 Vacuum interrupters | 3 On-board capacitors
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On-board capacitors
The on-board capacitors of the AMVAC breaker deliver the
current needed for creation of magnetic fields within the mecha-
nism thereby eliminating current draw and voltage drop from the
battery bank for the substation.
For more information on the maintenance of the capacitors,
please see the AMVAC Installation, Operation and Maintenance
Manual.
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