Bernstein 618.6121.122 Limit Switch I88-U1Z HW

Bernstein 618.6121.122 I88-U1Z HW limit switch is a plastic-bodied end switch from the I88 family, offering 1NO/1NC contacts in a RO11 variant for compact limit sensing and safety interlocks in automation equipment. It mounts with DIN 912 M5 screws and has a fixed actuation point tolerance of ±0.25 mm and an operating force tolerance of ±10%, supporting precise, repeatable trips in restricted spaces. Electrical ratings include Ui 250 V AC and Ue 240 V, suitable for AC-15 operation at 240 V / 3 A; it features direct opening action per IEC/EN 60947-5-1 annex K, a 10 A gG fuse, and a totally insulated enclosure (Protection Class II). The RO11 designation denotes the specified contact arrangement for this model, and Bernstein notes the device is intended for safety applications with fixed positioning to ensure reliable end-of-travel sensing in control panels and automation equipment. This model is documented in Bernstein datasheets and is widely listed under the I88-U1Z HW RO11 designation by major distributors.