The standard diameter of front operation head of board back type,
board back cable type built-in explosion-proof component is 30mm.
The operation head is installed on the board of 1 up to 6mm
thickness. The signal lamp, button and switch module are connected
to the pre-installed front operation head part with a clamp. The board
back type built-in explosion-proof component is mounted in the
increased safety (Ex-e) enclosure. The degree of protection is up to
IP54. The board back cable type built-in explosion-proof component
is used for the control apparatus and monitor apparatus widely.

The board back type built-in explosion-proof component is connected
to terminals. The board back cable type built-in explosion-proof
component is connected to the flexible cable of 3m.

The built-in ammeter with type of board back, board back cable type
is indirect measuring (for current transformer). This measuring way
is applied to various current ranges. The scales of ammeters for
current transformer are interchangeable. All of the scales of
ammeters are fitted with adjustable red pointers.

Features:
1) The sintered signs and letters in the button remain forever
2) The high brightness, long life signal lamp with a temperature
switch, secures the security temperature
3) The front operating head and built-in components are secured
with a clamp