Type No.:MAG-15kV load break bushing insert THBI
GENERAL INFORMATION
15kV underground connectors provide utilities with products having high reliability and low maintenance expense.
These connectors provide:
Piston-operated fault-close action Standard elbow and bushing insert loadbreak principle Small size for ease of
hot-stick handling
Field replaceable elbow and probe

Peroxide-cured EPDM compounds Separable connector bushing inserts and elbows are designed for use with single-conductor,
concentric neutral power cable having extruded insulation shielding.
With shield adapter products, the elbow can be used with cables having a metallic tape shield, wire shield, or lead sheath with tape
or extruded insulation shielding.
All insulating and conducting rubber components are made of a special formulation of an EPDM elastomer using a peroxide curing
process. The material and curing process provides superior elastomer stress relaxation characteristics under high ambient
temperatures and contributes to reliable, long-time operation in either aboveground or subsurface installations.
Elbow connector/bushing insert combinations are suitable for energized loadmake/loadbreak operations by a qualified lineman
using an shotgun-type hot stick. All elbow/bushing insert combinations are designed for use with subsurface or
pad-mounted installations.
Molded shields
Where to Use
15 kV loadbreak products are designed for operation on and connection to 15 kV class, 95 kV Basic Impulse Level
systems where the voltage ratings listed on this page are not exceeded.
Technical Data
RATINGS
Continuous voltage............................15 kV
Max. continuous voltage.................... phase-to-ground:8.3 kV
phase-to-phase:14.4 kV
Continuous current............................ 200 amp rms
0.17-second duration......................... 10,000 amp rms symmetrical
3.00 second duration......................... 3500 amps rms symmetrical
SHORT-TIME CURRENT RATINGS
phase and 3-phase circuits 10 loadmake/loadbreak 8.3 kV phase-to-ground, operations at 200 amps 14.4 kV
INSULATION WITHSTAND VOLTAGES
Basic Impulse Level.......................... 95 kV crest
60 Hertz (one minute)........................ 42 kV rms
DC (15 minutes)................................. 53 kV
Corona extinction voltage.................. 11 kV
SWITCHING
The Loadbreak Bushing Insert represents state-of-the-industry design in an All Copper construction. It is designed for installation
on transformers or other equipment
1. EPDM insulation - cured with peroxide process. Provides superior stress-relaxation characteristics, assuring long life under
high ambient temperature.
2. Interface - When a suitable elbow is installed, provides proper creep distance and water-tight joint.
3. Locking groove - Mates with elbow locking ring.
4. Molded shield - conductive, abrasion resistant 1/8 inch thick shield of peroxide cured EPDM. Three molded tabs provide
convenient points for external grounding of the shield.
5. Loadbreak assembly - includes Arc MateTMablative material that produces gas when exposed to the Loadbreak/Loadmake
switching arc.
6. Pinch-finger contacts - are part of loadbreak assembly which has All Copper current path.
7. Piston assembly - patented concept. Piston movement assists operator under fault-close conditions.
8. Interface - bushing-well interface.
9. Hex Broach - accepts 5/16 hex wrench to properly torque insert into bushing well.
10. Seating Indicator - molded into insert. Provides positive seating indication.
PRODUCT FEATURES
15 kV LOADBREAK BUSHING INSERT
Selection and ordering
THBI-15/200 Bushing Insert
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