Eaton Cutler-Hammer SJA Instructions Manual

Cutler-Hammer
Instructions for Mechanical-Latch Attachments for Type
SJA, SJD, SJO and SJS Contactors, 360 or 720 Amperes
HAZARDOUS VOLTAGE.
READ AND UNDERSTAND THIS MANUAL AND THAT
PERTAINING TO ITS ELECTRICALLY-HELD
CONTACTOR (SEE TABLE I) IN THEIR ENTIRETY
BEFORE INSTALLING OR OPERATING THE CON-
TROLLER. INSTALLATION, ADJUSTMENT, REPAIR
AND MAINTENANCE OF THIS TYPE OF EQUIPMENT
MUST BE PERFORMED BY QUALIFIED PERSONNEL.
A QUALIFIED PERSON IS ONE WHO IS FAMILIAR
WITH THE CONSTRUCTION AND OPERATION OF
THIS EQUIPMENT AND THE HAZARDS INVOLVED.
APPLICATION
These instructions apply to Type SJA, SJD, SJO and SJS
contactors that are fitted with mechanical-latch attach-
ments.
A LATCHED CONTACTOR SHOULD BE APPLIED
ONLY WHEN NECESSARY, AND WITH DUE RE-
GARD TO THE POSSIBLE FAILURE MODES OF
THE SYSTEM, FOR EXAMPLE, A POWER LOSS
OR SOLENOID COIL FAILURE. ONCE LATCHED,
THE CONTACTOR WILL REMAIN CLOSED, AL-
LOWING A FAILURE. SINCE POWER IS RE-
QUIRED TO TRIP THE UNLATCH SOLENOIDS,
PROVISION SHOULD BE MADE FOR MANUAL
TRIPPING, USING THE MECHANICAL TRIP ARM,
OR A STANDBY POWER SUPPLY, SHOULD THE
MAIN CONTROL POWER BE LOST.
OPERATION
When a Type SJ contactor with latch attachment is open,
the latch mechanism is unlatched and de-energized.
When the coil of a latch contactor is momentaily ener-
gized, its armature closes, closing the main power
Effective 11/97
DANGER
CAUTION
Fig. 1 Type SJO with Latch Attachment
TABLE I. REFERENCE MATERIAL
Electrically-Held
Contactor Type
Type SJA
Type SJA
Type SJD
Type SJO
Type SJO
Type SJS
contacts. As the armature seals to the magnet, a spring
pushes the latch arm up into position behind the arma-
ture to hold it closed mechanically, at the same time an
auxiliary coil-clearing contact (L63) on the contactor
opens the contactor coil circuit to de-energize the
contactor magnet. Although the magnet is de-energized,
the contactor will remain latched closed until a trip coil is
energized or the latch is tripped mechanically by a push
against its trip arm.
I.B. 48006
Ampere Instruction
Rating I.L. or I.B.
360A I.B. 48002
720A I.B. 48005
360A I.B. 48004
360A I.L. 16-200-33
720A I.L. 17047
360A I.B. 48003