Circuit breaker h3+ P250 TM ADJ 4P4D N0-100% 250A 50kA FTC. The compact circuit breaker complies with DIN EN 60947-2 and protects electrical installations and networks from overload and short circuits. The thermal release for overload current (Ir) and the magnetic release for instantaneous short-circuit current (Ii) can be adjusted separately. The neutral conductor protection can be activated via a control knob. It can be set to either 0% or 100% of Ir. The position of the knob indicates three different operating states (on = up, off = down, tripped = middle position). A locking device for the switch state in either the on or off position is integrated and can be used with a standard padlock without additional accessories. A test button allows for testing the tripping mechanism and opening the main contacts. A hinged cover with a captive quick screw provides access to the installation space for optional auxiliary contacts and other triggers. Integrated accessories can be seen and identified through a viewing window without opening the hinged cover.