This bulletin pertains to FG Wilson products fitted with 400 Amp 3Pole or 4Pole ABB breakers. The breakers may be shipped with plastic spacers fitted at the customer terminals (see figure 1). This is to prevent the breaker screws at the customer terminals from being over-tightened when there are no copper toes or cable terminations fitted. If over tightened, the screw may protrude beyond the plastic barrier, reducing the insulation protection between the phase and the chassis (see figure 2). They are not fitted or required when copper toes or cable connections are fitted. Figure 1 – Nylon spacer in place to prevent over-tightening and damage to insulation. Figure 2 – Over-tightened phase screws with broken/missing insulation.
Action Required: Remove and discard plastic spacers when fitting customer connections to the breaker. 2: Additionally, if the breaker is expected to be used where the customer terminals are repeatedly removed and refitted, fit copper toes and phase barriers to avoid the need for repeatedly refitting the nylon spacers. Part No. Description Quantity 10000-04760 Phase Barrier Kit (2 for 3-pole breaker) (3 for 4-pole breaker) 330-037 Copper terminal 1 per pole (e.g. 3 for 3-pole breaker) 500-234 Set screw M10 x 40 1 per pole 503-094 M10 Shakeproof washer 2 per pole Figure 3 – Toes and phase barriers fitted to protect breaker terminals.
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