Page 2.3
HIGH DENSITY RELAY MODULES 40-145/146/148
pickering
SECTION 2 - TECHNICAL DESCRIPTION
The limitations described are thermal characteristics, and short term closure counts or current increases in excess
of these numbers will not cause problems.
The closures noted refer to any setting which requires the relay state to be changed from it’s default (unpowered)
condition.
●
For SPST switching, this refers to the number of relays energised with the stated current flowing in the
contact.
●
For SPDT and DPDT switching, it refers to the relay being in the energised state and the stated current
flowing in the closed contact, In the un-energised state the thermal load will be lower.
●
For DPDT switching where current is flowing in both closed contacts, the recommendations count each
switch as two closures.
It should be noted that users with a Pickering Interfaces 40-908, 40-914 or 40-918 PXI chassis mounted in
accordance with the user instructions ensuring free air flow, can expect a capacity of 40W per slot.
Use in LXI Chassis 60-102B & 60-103B
Users wishing to use the 40-145 in an LXI chassis should consult Pickering Interfaces for information on the
maximum number of relay closures supported.
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