Horizontal Double Break Type Isolator (HDB) -

Turn & twist mechanism with self wiping contacts.
Fixed & moving blades are made out off hard drawn electrolytic copper
Simultaneous operation of three poles by individual/group with low operating torque
Type tested as per IS and IEC.
Suitable for all typical substation layouts.
Structures to suit requirements.
Motor/Manual operating mechanisms.
Terminal connectors of flexible/rigid suitable for horizontal/vertical take-off.

Technical Specification

1	Rated voltage	kV	12	36	72.5	123	145	245	420
2	Rated Current	upto Amps	1250	4000	4000	4000	4000	4000	4000
3	Rated Short time withstand current	kA peak	25	31.5	40	40	40	40	40
4	Rated peak withstand current	kV rms	62.5	80	100	100	100	100	100
5	Power frequency withstand voltage	-	-	-	-	-	-	-	-
	a) To earth	kV rms	28	70	140	230	275	460	520
	b) Across isolating distance	kV rms	32	80	190	265	315	530	610
6	Lightning impulse withstand voltage 1.2/ 50 (micro sec.)	-	-	-	-	-	-	-	-
	a) To earth	kV peak	75	170	325	550	650	1050	1425
	b) Across isolating distance	kV peak	85	195	375	630	750	1200	1425 (+240)
7	Switching impulse withstand voltage 250/ 2500 (micro sec)	-	-	-	-	-	-	-	-
	a) To earth	kV peak	-	-	-	-	-	-	1050
	b) Across isolating distance	kV peak	-	-	-	-	-	-	900 (+345)

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