circuit-breaker accessor. 3WL voltage transformer 3-pole for meas.function and meas.f. plus 380-690V/100V class 0.5 Accessory and spare parts for open circuit breakers 3WL up to 6300 A. The accessories and replacement parts of the 3WL air circuit breaker can easily be replaced or retrofitted at any time. The sizes have uniform accessories and are available worldwide. The accessories and replacement parts of the 3WL air circuit-breakers are especially characterized by: 1. Simple to configure, set up and retrofit due to modular design with just 3 sizes and uniform accessories. 2. RoHS-compliant. 3. Replaceability of the main contacts by customer himself.