Circuit track with potential-free switching contact Length 115mm (G½), with bedding. ■ Triggers a switching pulse while travelling with axles having a wheel flange height of 1.1 mm (ROCO standard). Using wheel flanges with a varying height can result in malfunctions. ■ With fault clearance to avoid switching spikes. ■ With bumper protection ■ Can also be used as a response instantaneous contact along with a response module or detector 10808.