The Bulletin 800TC-XAF Explosion-Protected Contact Block is a robust
solution for Class I Div. 2 environments, especially for E-stop and highvibration applications where typical reed switch solutions are undesirable.
Emergency Stop Applications – The magnetically operated design
of reed switches prevents their use with emergency stop devices. In
contrast, the 800TC-XAF explosion-protected contact block features a
positive-opening normally closed contact as required for conformance
with global emergency stop standards. Additionally, the design allows
contact block stacking which increases application fl exibility and
accommodates safety circuits for illuminated E-stop devices.
High Vibration Applications – Reed switches are hermetically sealed
in a glass envelope, which can be fragile and susceptible to damage
from stress related to high vibration. The body of the 800TC-XAF
explosion-protected contact block is molded from an extremely durable
thermoplastic resin, resulting in a contact block assembly that will
maintain Class I Div. 2 integrity in the harshest applications.
In addition to the explosive nature of fl ammable gases, liquids or vapors
potentially present in Class I Div. 2 applications, these materials can also
be highly corrosive. With that in mind, careful attention was given to the
material selection of the components used in the 800TC-XAF explosionprotected contact block to help ensure safe, reliable operation in the
most demanding environments:
• Glass-fi lled polyester contact block body
• Stainless steel hardware, including the terminal screws/clamps
and mounting screws
• Ceramic plunger
• Bifurcated spanner with pure fi ne silver contact tips
