Replacement for Intrinsically safe Cutler-Hammer D40RBH relay

Question

Replacement for Intrinsically safe Cutler-Hammer D40RBH relay

JDca (Electrical)

(OP)

25 Jul 03 14:20

Hello Everyone, I am looking for an interposing relay that will satisfy the isolation requirements between Intrinsically safe and Non-Instrinsically safe circuits.
Non-IS input on the 120V coil side and dry contact for the IS output side. In essence the output and input need to be electrically isolated via barrier
The current requirements is less than 1 Amp.
Class 1 Div 2 rated
Temperature rated -50 C to 50 C.

The D40RBH was perfect for the application but it is discontinued. This application is in the northern part of Canada so temperature do occasionally dip below -40 C.
I do not have any power panel nearby to install an explosion proof box with a heater and the whole nine yards.
And the coil has to be 120Vac as the actuator that is powering the relay is 120Vac.

Any suggestion.
JD

JDca (Electrical) · Answer 1 · 2003-07-30 15:06:16

Hello
Does anyone have any suggestion or does even anyone know what I'm talking about?

CHDean (Electrical) · Answer 2 · 2003-08-02 13:21:30

What is the complete catalog number? You're missing a digit or two. Most of this model has been discontinued but there are still a couple of cat#'s available in the US which should be available in Canada. Maybe one of the units in production can be adapted to your need.

JTM001 (Electrical) · Answer 3 · 2003-09-30 12:10:20

JDca,
Have you made any progress in your search? I am trying to find a replacement for this relay as well. I am looking at running the output contact of a standard relay through a Pepperl&Fuchs relay output module. The output will be a dry IS contact, however the P&F device is not rated for a hazardous area and will need to be installed in an explosion proof box. It is also only rated for use down to -20C, although the rep tells me -35C as long as it is installed above -20C. Oh yeah, it needs a 24VDC power supply too.
I don't like this solution so I'm sure my client won't. Hope you can help.

JTM001 (Electrical) · Answer 4 · 2003-10-09 10:42:20

Just in case ANYONE is following this...
The plan is tentitively as follows:
Use an Allen-Bradley 700R relay which is rated for mounting in -40C and Cl. 1, Div. 2 (no, relay does not have IS output contacts). We will manufacture an IS contact using an MTL 2215. The MTL device is rated for mounting in Cl. 1, Div. 2 but only rated for -20C. However, MTL confirms that the device will work down to -40C. The switching time quoted is for -20C, this will be slower at -40C. MTL also confirms that the response time quoted is for cold start. If the device is continuously powered there is some internal heat generated and the switching time would be pretty close to the -20C rating.
Some fine details to work out but there's one possible solution for you.

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Replacement for Intrinsically safe Cutler-Hammer D40RBH relay