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- Page 4 Time Overcurrent Relays Type GEI-19957 PANEL LOCATION SEMI-FLU SH �UR.F.l.CE 6.625 OF STUDS NUMBERING IS7MM ----4 (BACK VIEW) 6" 1 8 7 10 - 32 SC RE W 19 17 1 5 13 - - r -�OR STUD) 00000 · ·-"!. (504MM) 19.B75 I EM�...
- Page 7 GEH-1753J INSTRUCTIONS TIME-OVERCURRENT RELAYS TYPES IAC51A IAC52A IAC51B IAC52B IAC51R GENERAL ELECTRIC...
- Page 8 Rel ays Typ e lA C T i.m e Qv e rcu rr GE H- 17 53 TOP PIVO T TA P PL UG SEA V IN UNI T HOL DIN G COI L SEA L-IN UNI T SEA L-I N...
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Page 9: Time-Overcurrent
TIME-OVERCURRENT RELAYS TYPE lAC INTRODUCTION & Contact Instantaneous AC Trip Induction Outline Internal Type Circuits Unit Unit Unit Panel Drilling Connection Fig. 11 Fig. 18 IAC51A(-)A Fig. IAC51B(-)A Fig. 13 Ye s Fig. 18 IAC51R(-) A Tw o Fig. 18 Fig. - Page 10 GEH-1753 Time Overcurrent Relays Type • • � � •• •• •• ·- G> •• ·- G> ·- . II I I 10 .1 .7 .I 50 80 70 80 11 0 ! MULTlPLES OF RELAY TAP SETTING Fig.2. (088880269 with [3)} Time-current Curves...
- Page 11 Time Overcurrent Relays Type IAC GEH-1753 The current-closing rating of the contacts is BURDENS amperes for voltages not exceeding volts. The current-carrying ratings are affected by the Burdens for the standard coils are given in the selection of the tap on the target and seal-in coil following table.
- Page 12 Time Overcurrent Relays Type IAC GEH-1753 A-C BUS '·' FUNCTION NUMBERS FOR USE DEVICE WITH ALL EXTERNAL DIAGRAMS Instantaneous Unit Overcurrent, Relay, Type IAC Ground Overcurrent Relay, Type lAC Power Circuit Breaker Seal-in Unit, with Target Fig. 4 (K-6375667-2) External Connections of Three Trip Coil Type IAC51A Relays used for Phase - to-Phase and Ground Overcurrent Portection of a 3-Phase Circuit.
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Page 13: Instantaneous Unit
GEH-1753 Time Overcurrent Relays Type lAC INSTANTANEOUS UNIT INTRODUCTION mounted beside the adjustable pole piece. Time current characteristics shown Fig. The instantaneous unit is a small instantaneous hinge-type unit which may be mounted on the right RATINGS front side the induction unit (See Fig. - Page 14 GEH-1753 Time Overcurrent Relays Type lAC A·C TRIPPING UNI1 INTRODUCTION The a-c tripping unit is a Type REA relay unit laS I BREAKER designed to en ergize a circuit breaker trip coil from TRIP COIL its associated current transformer upon the operation of the main unit of the lAC relay.
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Page 15: Receiving, Handling And Storage
Time Overcurrent Relays Type IAC GEH-1753 APPLICATION which has contacts rated amperes, can be used in conjunction with lAC overcurrent relays. REAllB is not mounted inside the lAC case. The a-c tripping unit is used in Type lAC re11.ys where a reliable direct-current tripping source is available and is necessary to trip the breaker... - Page 16 GEH-1753 Time Overcurrent Relays Type lAC INDUCTION u�:-:- SEAL-IN A-C \RIP UNIT INSTANT. Internal Connections for the Type IAC51R Relay Fig. 13 (K-6209294-3) (Front View) INDUCTION INDUCTION UNIT SEAL-IN UNIT SHORT FINGER (K-6209662 [5]} IAC52A Fig. Internal Connections for the Type Relay (Front View)
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Page 18: Target And Seal-In Unit
GEH-1753 Time Overcurrent Relays Type IAC ADJUSTMENTS TARGET AND SEAL-IN UNIT The primary adjustment for the time of opera tion the unit is made by means of the time dial. For trip coils operating on currents ranging However, further adjustment is obtained by moving from 0.2 up to 2.0 amperes at the minimum control the permanent magnet along its supporting shelf;... -
Page 19: Operation
Time Overcurrent Relays Type lAC GEH-1753 CONTACT ADJUSTMENT CONTACT ADJUSTMENT With the unit de-energized, the movable contact The contacts should have approximately 1/32 should lie against the stationary contact with enough inch wipe. That is the stationary contact should be tension to always insure a good closed circuit. - Page 21 Time Overcurrent Relays Type GEH-1753 SEMI-FLUSH--PANEL LOCATION IITC. SURFACE WTG. STUD STUD NUIIBER INC NUMBERING 'RONT VIEW FRONT VIEW FIG. -A I AC52B 1000 �9_Q • VIEW SHOWING ASSEMBLY OF HARDWARE FOR SURFACE WTG. ON STEEl PANELS. OUTLINE � � DRILL ) DRILL 2 HOLES...
- Page 22 GE Power Management 215 Anderson Avenue Markham, Ontario Canada L6E 183 Tel: (905) 294-6222 Fax: (905) 201-2098 www.ge.com/indsys/pm...