ETR2

The Schlegel Elektrokontakt ETR2 is a precision-engineered momentary switch designed for industrial control applications requiring reliable, forced-opening contact operation. This compact switch features a 6 mm actuation travel with a mechanical and electrical service life of up to 1 million switching cycles at rated loads, ensuring long-term durability in demanding environments. The ETR2 is equipped with 2 normally closed (NC) and 2 normally open (NO) contacts, providing flexible circuit configurations for monitoring, signaling, or control functions. Contacts are constructed from AgNi (silver-nickel) alloy, delivering low contact resistance (<20 mΩ new) and stable performance across a wide temperature range from -30°C to 70°C operating and -50°C to 70°C storage. Screw terminals accommodate wire sizes from 1 x 0.5 mm² to 2 x 2.5 mm², secured with a torque range of 0.8–1.0 Nm for reliable electrical connections. The switch meets IEC/EN 60947-5-1 and IEC/EN 61058-1 standards, supporting use categories AC15 and DC13 with rated insulation voltage of 400 V and operating voltages up to 400 V AC or 250 V DC. It supports minimum switching currents of 1 mA at 5 V, making it suitable for low-power control circuits. The forced-opening design (Zwangsöffnend) per EN 60947-5-1 Annex K ensures safety-critical applications can rely on positive contact separation. With approvals including CCC, CE, cULus, DNVGL, and UKCA, the ETR2 is ideal for integration into control panels, machinery automation, safety circuits, and industrial equipment requiring precise, repeatable momentary actuation.