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Contactors with magnetical latching ..AMA type

2 For R63 ... R200 contactors

Air-gap Description
Permanent magnet Contactors with magnetical latching are very similar to standard contac-
tor in construction and dimensions. Only the electro-magnet and the coil
Electro-magnet of contactors ..AMA have a specific design.

12 AC operated: ..RR..AMA
DC operated: ..R..AMA
i1 i2
A permanent magnet is mounted in the upper part of the fixed laminated
BA circuit.
The double-winding coil is always fed from d.c. supply (from rectifier for
+- + IORR..AMA type) and has:
–– 1 terminal for "De-latching" + marked "A1" (red)
Block diagram –– 1 terminal for "Latching" + marked "A2" (red)
–– 1 common terminal (blue).
Coil windings are only energized at the point of opening and closing of 1SBC104090S0201
the contactor.
1 N.O. auxiliary contact is fitted as standard. For additional auxiliary con-
tact, refer to "Auxiliary contact fitting details".

Applications
–– Contactors which remain permanently closed, that allows energy saving
–– Installations where the control circuits are fed from batteries and

where it's needed to reduce the power consumption
–– In case of accidental supply failure, the user knows the state (ON or

OFF) of the contactor when the failure occurred
–– Contactors which must remain closed for safety reasons, even if the

control circuit current decreases
–– Contactors in distribution circuits. The contactor is used as an isolat-

ing switch
–– Protection against accidental failure of the main supply.

Operation
Contactor closing (latching)
The electro-magnet being open, the coil winding (1) is fed via the contact
B with a current i1. The strength and direction of the magnetic field
produced in this winding is the same as that produced by the permanent
magnet.

Contactor opening (de-latching)
The electro-magnet being closed, the coil winding (2) is fed via the con-
tact A with a current i2. The direction of the field produced by current i2,
open the contactor.

Contactor opening and closing
On opening and closing of the contactor, the coil is immediately de-ener-
gized by auxiliary contacts B and A mounted on the contactor.

Mechanical durability
0.2 millions of operating cycles.

2/4 | ABB R contactors