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Vertical-break disconnectors type VSSBIII

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// Product information

Vertical-break disconnectors type VSSBIII


The vertical break disconnector consists of three pole­s. Each pole consists of a frame, one rotating insulator and two support insulators on which the main blade is mounted.


The frame is made of a square tube on which the insulators are mount­ed. The bearing housing for the rotating insulator is also mounted in this frame. The bearing housing is sealed and filled up with grease, to ensure a long lifetime. All steel parts of the disconnector are hot-dip galvanized.


The disconnectors can be equipped with insulators in accordance with IEC, ANSI or DIN specifications.

Main blade

The main blade is made of an aluminium tube, which has silver-plated copper contacts at both the hinge end and the jaw end. During closing of the disconnector, the main blade makes a double movement: First, the blade is lowered so that it reaches full horizontal position and then the main blade rotates so that contact pressure is applied to both the hinge end and the jaw end of the disconnector.

  • The main contacts are of the “reverse-loop” design, which makes them suitable for very high short circuit currents.
  • All contact fingers are made of silver-plated copper and are equipped with stainless steel springs to ensure reliable contact pressure.
  • The main terminals are made of flat aluminium and can be drilled as per request.
  • Depending on the voltage rating, anti-corona shields will be provided.

Earthing switch

Hapam disconnectors may be equipped with earthing switches, which can be built-on to the right hand side and/or to the left hand side.
The earthing switch consists of an aluminium tube, provided with silver-plated contacts at both ends.

Drive mechanism

The disconnectors and/or earthing switches can be single-pole or three-pole operated by means of a motor-operated drive mechanism or a manual-operated drive mechanism. In case only one drive mechanism is used for three-pole operation, the poles are interconnected by means of adjustable coupling rods.
The drive mechanism also houses the auxiliary contacts for position indication.


The disconnectors and earthing switches are designed and tested in accordance with latest IEC specifications. Hapam main­tains a q­uality assurance system according to ISO 9001, certified by DEKRA (previously known as KEMA).


The disconnectors and earthing switches are pre-assembled and ad­justed in our works as complete as possible.
The construction is designed so that all disconnectors can be instal­led and adjusted at site very easily, without the need of any special tools. Hapam provides clear installation instructions and assembly drawings.


The disconnectors and earthing switches supplied by Hapam are d­esigned so as to ensure that they are virtually maintenance free. However, to warrant a long and trouble-free service period, we advise that a visual inspection of the contacts and bearing points be carried out at regular intervals.

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