Integration in power distribution equipment
7.5 Phase barriers and horizontal partitions
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
537
7.5 Phase barriers and horizontal partitions
Functional safety is assured up to a nominal voltage of 1150 V AC without phase barriers
or horizontal partitions on the 3WA circuit breaker. In the event of special requirements,
phase barriers may be installed by the customer to act as arcing fault barriers.
Mounting phase barriers/horizontal partitions as arcing fault barriers
1. Fabricate the phase barriers/horizontal partitions using the following materials:
– NEMA GPO-3 material, minimum thickness 2.3 mm (0.91 in), max. 4.0 mm (0.16 in)
(e.g. G-Etronax PM GPO-3 from Isola AG)
– Or similar material: e.g. Durapol FR-HA2 from Isola AG
2. Insert the phase barriers/horizontal partitions into the grooves on the rear of the fixed-
mounted circuit breakers or guide frames.
3. Screw the inserted phase barriers/horizontal partitions into the mounting holes, see
graphic below.
Proceed as follows: Tighten the screws until the screw head makes contact. Then
tighten the screws with a torque of 1.2 ± 0.2 Nm.
8 mounting holes for self-tapping screws (Ø 4.2 mm, max. screw-in depth 16 mm)
Guide groove, width: 4 mm (0.16 in)
Observe the spacing to live parts on the rear panel of the circuit breaker.
Perform an insulation test of the switchgear prior to commissioning.
Do not use conductive material for phase barriers or partitions.
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