Fire alarm button BXN explosion proof manual fire alarm button alarm button has 0.25/1.6/2.5/6/2/6A six kinds of operating current, proof mark for ExedIIBT6 or ExdIICT6, protection class IP54, IP65 class protection requires special occasions, can be made when ordering custom; corrosion grade WF1, inlet and outlet thread has G1 / 2 or G3 / 4 two kinds. Features: Use aluminum shell repression, surface spray, enhanced corrosion resistance; internal explosion button mounted, explosion lights and other components; may use pipe or cable wiring. External Dimensions Figure may call or letter request. Manual alarm button