IEC/EN60947. UL, CSA. Illuminated models require a suitable LED to be fitted (see stock no. ; 399-3646 399-3646 or ; 399-3747 399-3747 ) Contact blocks must be purchased separately see stock no. ; 399-3551 399-3551 typically. Emergency Stop Switch, Actuator. Tamper proof to ISO 13 850/EN 418 Fits standard 22mm mounting hole 90mm label supplied Protective collar is designed to be used with RMQ Titan E-Stop heads, to reduce the chance of operating a E-Stop unintentionally by striking it, It is fitted between the E-Stop head and the mounting panel