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GENERAL DESCRIPTION
Type H - 3 POWER AIR CIRCUIT BREAKERS ARE SUITABLE FOR
CONTROLLING AND PROTECTING LOW VOLTAGE POWER CIRCUITS
UP TO 250 VOLTS DC AND 600 VOLTS AC. THEY ARE A MEANS OF
SAFELY SWITCHING LOADS AND AUTOMATICALLY CLEARING
CIRCUITS WHEN ABNORMAL CONDITIONS SUCH AS UNDER- VOLTAGE,
SUSTAINED OVERLOADS, AND SHORT-CIRCUITS OCCUR.
THE THREE MAIN FUNCTIONAL COMPONENTS OF THE TYPE H3
BREAKER ARE ITS MECHANISM, THE CONDUCTIVE MEMBERS AND THE
INTERRUPTING DEVICES.
1. THE MECHANISM IS DESIGNED TO RECEIVE ENERGY,
STORE IT, AND DELIVER IT TO CLOSE THE BREAKER CONTACTS WHEN
REQUIRED. UPON ACTIVATION OF THE TRIP DEVICE, THE MECHANISM
ALLOWS THE CONTACTS TO OPEN REGARDLESS Of THE STATE OF THE
MECHANISM, THAT IS THE BREAKER MECHANISM
IS "TRIP-FREE".
HIGH SPEED BREAKER CLOSING OPERATION IS ACHIEVED
THROUGH THE RELEASE OF A PRE-CHARGED (STORED ENERGY TYPE)
CLOSING SPRING, WHILE THE COMPRESSED MAIN MOVING CONTACT
SPRINGS AND THE CLOSING SHAFT TORSION SPRING PROVIDE THE
ENERGY FOR THE HIGH SPEED CONTACT SEPARATION AND OPENING
OF THE BREAKER.
BREAKERS ARE PROVIDED WITH EITHER A MANUALLY
OPERATED HANDLE OR AN ELECTRIC MOTOR FOR COMPRESSING THE
CLOSING SPRING.
2.
THE CONDUCTIVE MEMBERS ARE ASSEMBLED ON A
MOULDED BASE OF FIBERGLASS-REINFORCED POLYESTER.
INDIVIDUAL POLE PIECES CAREFULLY INTERLOCKED TOGETHER AND
SUPPORTED BY A STEEL FRAME PROVIDE THE MECHANICAL
SUPPORT AND INSULATING STRUCTURE REQUIRED. THE CONDUCTIVE
MEMBERS COMPRISE THE MAIN POWER TERMINALS OR DRAWOUT
CONTACTS, THE MAIN FIXED CONTACTS AND THE MAIN MOVING
CONTACTS.
3. THE INTERRUPTING DEVICES ARE THE FIXED AND MOVING
ARCING CONTACTS AND THE ARC CHUTES.
IN ADDITION TO THESE MAIN FUNCTIONAL COMPONENTS THE
BREAKER IS AVAILABLE WITH OVERLOAD PROTECTION AND OTHER
ACCESSORIES AND INTERLOCKING DEVICES.
2. RECEIVING - HANDLING - STORAGE - INSTALLATION
2.1 RECEIVING
IMMEDIATELY UPON RECEIPT OF THE BREAKER AN
EXAMINATION SHOULD BE MADE FOR DAMAGE SUSTAINED IN
TRANSIT.
IF DAMAGE HAS OCCURRED OR THERE IS EVIDENCE OF
ROUGH HANDLING, A CLAIM SHOULD BE FILED IMMEDIATELY WITH
THE TRANSPORTATION COMPANY AND SCHNEIDER ELECTRIC
SHOULD BE NOTIFIED. CHECK ALL PARTS AGAINST THE PACKING LIST
TO MAKE SURE ALL THE CORRECT ITEMS HAVE BEEN RECEIVED.
2.2 HANDLING
LIFT THE BREAKER BY THE STEEL CHANNELS AT THE FRONT
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AND BACK. DO NOT LIFT BY THE CONNECTING TERMINALS, ARC
CHUTES, OR OPERATING HANDLE. SPECIAL LIFTING DEVICES ARE
AVAILABLE FOR USE WITH OVERHEAD CRANE OR SIMILAR MEANS
(SEE SECTION 9. 1 ). CHECK THE UNIT THOROUGHLY TO SEE THAT NO
PARTS WERE DAMAGED OR FORCED OUT OF ALIGNMENT DURING
SHIPMENT. IF REPLACEMENT PARTS ARE REQUIRED, THE MANU-
FACTURER SHOULD BE NOTIFIED PROMPTLY. THE BREAKER SHOULD
BE INSTALLED IN A CLEAN DRY VENTILATED AREA WHICH IS FREE
FROM ATMOSPHERIC CONTAMINANTS.
2.3 STORAGE
EACH CIRCUIT BREAKER SHOULD BE STORED IN ITS SHIPPING
CONTAINER IN AN UPRIGHT POSITION IN A CLEAN DRY AREA. SHOULD
THE UNIT GET WET, IT MUST BE THOROUGHLY DRIED OUT USING
FORCED WARM AIR OVER AN EXTENDED PERIOD UNTIL " INFINITE"
READINGS ARE OBTAINED USING A 600 VOLT MEGGER.
2.4 MOUNTING
H-3 AND HL-3 CIRCUIT BREAKERS SHOULD BE MOUNTED IN
SHEET STEEL ENCLOSURES IN ACCORDANCE WITH RECOMMENDED
DIMENSIONS. THE MOUNTING SUPPORT SHOULD BE A RIGID
STRUCTURE ABLE TO WITHSTAND THE IMPACT CAUSED BY THE
SWITCHING OPERATIONS, WITHOUT ANY DISTORTION AND UNDUE
VIBRATION OF THE MECHANISM. ALL H-3 AND HL-3 ENCLOSURES,
WITH THE EXCEPTION Of THE 6000A 1OOH-3, REQUIRE AN INSULATING
BARRIER MADE Of 1/16 INCH THICK NEMA GRADE GPO-3 MATERIAL
INSTALLED ON THE INSIDE TOP SURFACE USING NON-METALLIC
HARDWARE. NOTE THAT THE WIDER BARRIERS MAY REQUIRE
ADDITIONAL HARDWARE TO SUPPORT THE OUTER EDGES.
FIG. 2.4 ENCLOSURE INSULATING
ENCL.
BARRIER
WIDTH
"A"
18
25
30
32
36
38
45
MOUNTING
WIDTH
HOLES
"B"
"C"
16
8 3/4
17 5/8
15 3/4
22 5/8
15 3/4
31
15 3/4
34
15 3/4
37
15 3/4
44
15 3/4
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