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Insulating equipment

The portfolio of connection accessories includes a broad range of insulating equipment.
The diagram below provides an overview of insulation accessories available for 3VA molded case circuit breakers.

Phase barriers

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Phase barriers provide insulation between the individual phases of the molded case circuit breaker. They are simply snapped into place on the 3VA molded case circuit breaker.

Phase barriers can be used in combination with the insulating plate and the broadened insulating plate. in order to provide additional insulation from the mounting plate.

Phase barriers are compatible with:

  • Box terminal

  • Circular conductor terminal

  • Front connection bar extended (included in scope of supply)

  • Front connection bar broadened (included in scope of supply)

  • Front connection bar edgewise (included in scope of supply)

  • Lug terminal right-angled (included in scope of supply)

  • Other insulation accessories: Insulating plate or insulating plate, broadened

Depending on the intended purpose of the phase barriers, they must be snapped into position in the direction indicated by the arrows below:

Terminal cover, extended terminal cover and broadened terminal cover

All terminal covers afford degree of protection IP40 at the front of the breaker and degree of protection IP20 at the infeed and load ends provided that they are correctly installed (cutting of grille structure).

All terminal covers have a marking on the inside face which can be drilled through before the cover is installed. A voltage detector can be inserted through this bore to test for safe isolation.

WARNING

Reduced degree of protection

If a hole is drilled through the terminal cover, degree of protection IP40 is no longer afforded.

Suitable precautions must be taken to safeguard against any hazards posed by this loss of protection.

Phase barriers can also be installed on all terminal covers in order to maintain the required clearances and creepage distances which might be reduced as a result of ionized gas following a short circuit.

Terminal cover

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The terminal cover is compatible with:

  • Box terminals

  • Circular conductor terminals

  • Lug terminals

The terminal cover is simply snapped into place on 3VA1 breakers, or is snapped into place and secured with 2 screws on 3VA2 breakers.

Extended terminal cover

The extended terminal cover always consists of two parts:

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Rear insulating plate, provides insulation from the cubicle mounting plate

Front half, pushed over the molded case circuit breaker from the front

The insulating plate is fitted to the rear panel of the molded case circuit breaker and then secured by 2 screws to the front half of the terminal cover. The extended terminal cover is also secured by 2 additional screws to the molded case circuit breaker itself.

The extended terminal cover is compatible with:

  • Circular conductor terminals, large (extended terminal cover included in scope of supply)

  • Circular conductor terminals, 2 cables (extended terminal cover included in scope of supply)

  • Circular conductor terminals, 6 cables (extended terminal cover included in scope of supply)

  • Front connection bars extended

  • Front connection bars edgewise

Broadened terminal cover

The broadened terminal cover always consists of two parts:

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Rear insulating plate, provides insulation from the cubicle mounting plate

Front half, pushed over the molded case circuit breaker from the front

The insulating plate is fitted to the rear panel of the molded case circuit breaker and then secured by 2 screws to the front half of the terminal cover. The broadened terminal cover is also secured by 2 additional screws to the molded case circuit breaker itself.

The broadened terminal cover is compatible with:

  • Front connection bars broadened

Insulating plate and broadened insulating plate

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In certain cases it may be necessary to provide insulation from the cubicle mounting plate. The insulating plates for the 3VA molded case circuit breakers are designed for this purpose.

The insulating plate is fitted to the rear panel of the molded case circuit breaker and can be installed in combination with phase barriers.

Potential applications:

  • Insulating plate:

    • Connection bar extensions

    • Non-insulated, straight conductors / terminals

  • Insulating plate, broadened

    • Broadened connection bars

Side plate for 3VA1 2-pole

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CAUTION

Risk of injury

A side plate must be fitted if the side surface at the handle end of a 2-pole 3VA1 breaker with current rating In > 100 A is freely accessible.

For further information, please refer to Operating Instructions 3ZW1012-0VA10-2AA0.

The order number for the side plate is 3VA9112 - 0SG20.

DC insulating plate

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A DC insulating plate must be installed on 3-pole and 4-pole molded case circuit breakers for some applications:

  • Ue > 415 V AC: For IT system applications and entry of incoming feeder cables through the bottom panel of the circuit breaker with non-insulated mounting plate

  • Ue > 250V DC: with non-insulated mounting plate

For further information, please refer to Operating Instructions 3ZW1012-0VA10-0AA0

The order numbers for the DC insulating plates are 3VA9113-0SG10 (3-pole) and 3VA9114-0SG10 (4-pole)

Insulating equipment

Touch protection

Insulated cables and busbars

With insulated cables and busbars that have insulation that reaches inside the terminal compartment of the 3VA molded case circuit breaker, the unit is classed as finger-safe (IP2X) if it is also equipped with a terminal cover. This protection is guaranteed only if the unit is installed and wired correctly.

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Non-insulated cables and busbars

With non-insulated cables and busbars, and front connection bars extended or front connection bars broadened, the unit is classed as finger-safe (IP2X) if it is also equipped with an extended or broadened terminal cover. This protection is guaranteed only if the unit is installed and wired correctly.

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External circular conductor terminals

External circular conductor terminals are supplied as standard with an extended terminal cover. The external circular conductor terminals are classed as finger-safe (IP2X) on condition that the extended terminal cover is correctly installed.

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Terminal cover

Terminal cover, extended

Terminal cover, broadened

Insulating plate

Insulating plate, broadened

Phase barriers

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Front connection

Rear connection for right-angled lug terminal

In combination with insulating plate

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Marking for bores

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