Compact and robust solenoid interlocks for extreme applications and environmental conditions

With the Ex STM 515 series, the steute business division Controltec has introduced compact and robust solenoid interlocks for explosive zones to its range of safety switchgear. This series is now being further extended to include an "Extreme" variant. As always at the company, the variant can be used in adverse ambient conditions, such as dust, dirt, wet and vibrations.

Prerequisites comprise a robust die-cast aluminium enclosure with a long lifetime even when exposed to severe mechanical wear and tear. The multiple coating (passivation, primer, powder coating) guarantees high corrosion protection, while the effective sealing achieves protection classes IP66/67. Wet and damp are, therefore, not a hindrance when using the device – particularly since the electrical connections are well protected inside a terminal compartment. Shocks and vibrations are additional ambient conditions in which this variant functions reliably.

Independently of the Extreme variant, the complete series includes practical features such as an actuator head which can be repositioned by 4 x 90°. Equally typical of the company's switching devices is a modular design with diverse extra functions. For example, users can select between the spring-to-lock and the power-to-lock principle (for tasks which are non-safety-related) and also opt for auxiliary release (from the access side) and/or escape release/emergency unlocking (from the danger zone).

The new variant can benefit applications such as machines and plants in the bulk goods industry that do not require explosion protection.