Danfoss BCP4H high-pressure safety limiter for steam and hot-water boilers, genuine OEM code number 017B0042. Dedicated pressure switch for safety and pressure monitoring of boiler plant; fail-safe dual-bellows sensing element gives premature cut-out on a fault. Regulation (setting) range 1 bar to 10 bar (Pe), differential fixed 0.45 bar. Single-pole changeover (SPDT) snap-action microswitch with manual (max) reset. Locks out on rising pressure and requires a deliberate manual reset (by tool) once the fault is cleared — the max-reset safety-limiter function for over-pressure protection of steam and hot-water boilers. G½A male pressure connection (ISO 228-1); DIN 43650-A / EN 175301-803 plug, Pg 11; IP65 enclosure. Media steam, water or air; media temperature up to 120 °C (fit a water-filled siphon above 120 °C); ambient -20 °C to 70 °C. Max. working pressure 25 bar (360 psig), test 27.5 bar, burst 37.5 bar. Fail-safe to SIL 2 (IEC 61508). PED 2014/68/EU category IV safety equipment, TÜV component-tested (test basis EN 12952-11 / EN 12953-9). EAN 5702423248131.