1A - SET SCREW CONTACTSSet screw contacts remove the need to solder the cable into the contacts. The cable is secured using two preinstalled bronze Allen head set screws. These contacts are often used for on-site cable installations and they maintain all the standard features and carry the same amp rating as the solder contacts. | 
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1B - 500MCM PHASE CONTACTSTo maintain a proper wall thickness 530MCM contacts require a larger cable end contact than our standard contact. TJB 530MCM contacts fit the standard insulators and have no limitations regarding compatibility. The larger contacts are made with the same silver plated solid copper construction and are fixed in the insulators in the same manner as the standard contacts. | 
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2A - 8KV INTERLOCK COVERAlso called a shorting cover an interlock cover connects the ground and ground check when the cover is in place and allows other outputs on the circuit to be energized without tripping the ground check monitor. Use suffix 2B for 15KV covers. | 
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2B -15KV INTERLOCK COVERAlso called a shorting cover an interlock cover connects the ground and ground check when the cover is in place and allows other outputs on the circuit to be energized without tripping the ground check monitor. The 15KV cover has a built in rubber insulator to fully enclose the phases in insulating material. | 
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2C - 15KV & 25KV PTFE INTERLOCK COVERAlso called a shorting cover an interlock cover connects the ground and ground check when the cover is in place and allows other outputs on the circuit to be energized without tripping the ground check monitor. The PTFE interlock covers are similar to our rubber 15KV covers but with all the advantages of PTFE, including being an easy to clean hydrophobic material, is not reactive in acidic environments, and does not track when exposed to high electrical stress. Specify 15 or 25KV when ordering cover separately. | 
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3/3A- KIRKLOCK WITH COVERA Kirklock is a brand of lock that is used as a mechanical interlock to prevent couplers from being opened or covers from being removed when the power is on. All Kirklock equipped couplers come with a dust cover (suffix 3) or an optional weatherproof cover (suffix 3A). Locks can be keyed alike or differently and serial numbers are tracked so future orders can me matched or differentiated. | 
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3B - PADLOCK PROVISIONThe padlock provision enables the user to use a standard padlock (not included) to either lock the cover in place or to lock two couplers together. Padlock devices can be used as a self-managed interlock system or for security. | 
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4/4A/4B - ADDITIONAL GROUND CHECKSAdditional ground checks provide for redundancy in the ground check system. TJB high voltage couplers come standard with one ground but can accommodate two (suffix 4), three (suffix 4A), or four (suffix 4B) total ground checks. In all configurations every ground check makes contact after the phase and ground contacts and breaks contact before the phase and ground contacts, ensuring that there is never an improper signal path. | 
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5 – LARGE END BELL FOR CABLE OVER 3”Cable over 3” diameter requires the use of our large end bell and cable entrance. Our large end bell is approximately 2” taller than our standard bell and has a larger cable opening resulting in a larger interior volume. | 
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5A – LARGE BELL FOR CABLE UNDER 3”Our standard will fit cable up to 3” in diameter, but if you need more room we also offer our large end bell with clamps to fit cable sizes smaller than 3”. | 
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5B - LARGE BELL W/EXTENSION FOR CABLE OVER 3”When you have large cable and you want |
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