Undervoltage release UVR 220...240 V AC/DC Accessories for circuit breakers 3WL10 / 3VA27 Accessories and spare parts for air circuit breakers 3WL10 up to 1250A. (also 3VA27 - 1600A) The accessories and spare parts for the air circuit breaker 3WL10 are easy to replace and can be retrofitted at any time. Accessories and spare parts for the air circuit breaker 3WL10 are particularly characterized by: 1. Easy to plan, install and convert thanks to modular design 2. RoHS compliant 3. Main contacts can be replaced by the customer themselves.