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Klixon CR Series |
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2CR Series |
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3CR Series |
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4CR Series |
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Business machines |
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Computing machines |
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Power tools |
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Food machinery |
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Portable appliances |
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Dishwashers |
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Sensata > Products > Controls > Motor Controls >
Klixon® 2CR series starter relay motor protector
For AC starter relays up to 7 amps at 250V or 10 amps at 115V
| Features and Overview |
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Snap–action Klixon disc |
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All position performance: balanced armature allows mounting and operation in any position |
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Wide range of pick-up and drop-out ratings |
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Small size for installation in compact equipment |
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Clean, positive contact "breaks" and "makes" with wiping action: high contact forces developed by magnetic circuit with more iron and copper |
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Stable operating values: continuously open magnetic circuit eliminates residual magnetism |
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Rugged, all-welded construction fully enclosed in phenolic case |
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Economical |
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CODE: 2CR series
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Designed for all position operation, the Klixon 2CR is a current–type of motor starting relay which can be used on both split–phase and capacitor–start motors.
The compact 2CR can be mounted and operated in any position, either in the motor or at a convenient location away from the motor. This allows motor size to be reduced since a space-consuming centrifugal switch is not required.
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The 2CR relay utilizes a rotating balanced armature which is held normally open by a biasing spring. Rotation of the armature — which carries the movable contact arm — is caused by the magnetic field produced by motor current in the relay coil. Large make and break contact forces are developed by using a large iron cross-section in the magnetic circuit and a high number of ampere-turns. A beryllium copper contact arm of high conductivity assures excellent current carrying capability. Stable calibration values are achieved by biasing the armature with a stainless steel torsion spring having a large number of turns and low spring rate. All parts are fully enclosed in a rugged phenolic case.
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The 2CR relay coil is in series with the main winding of the motor and the normally open contacts are in series with the start winding. When voltage is applied to the motor, the in–rush current of the main winding through the relay coil creates a magnetic force which instantly rotates the armature. This action closes the relay contacts and energizes the motor start winding. As motor speed increases, the current in the main winding and relay coil decreases to a point where the armature biasing spring force is greater than the decreasing magnetic force and the armature rotates back to its original open position. This opens the relay contacts and disconnects the start winding.
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| Pick–Up and Drop–Out Ratings |
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Ratings indicate maximum pick–up and minimum drop–out current limits. A production relay of a given rating will have a pick–up and drop–out current within the rating limits.
Pick–up is the current through the relay coil required to close the relay contact.
Drop–out is the current through the relay coil at which the contacts open.
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