Spring return contact block, 2 NO, front mounting, 30 or 40mm centres. range of product: Harmony XAC – product or component type: contact block – component name: XACS – electrical circuit type: control circuit – contact block type: single – type of operator: spring return – product compatibility: XACA, ZA2B… head – mechanical interlocking: without mechanical interlock – contacts type and composition: 2 NO – mounting of block: front mounting – contact operation: slow-break.