Replacing QO240GFI with D64RP410 + CT + Shunt-Trip

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ohad

New User
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isr
Occupation
electric engineer
Hello,


I want to replace a QO240GFI 240 V GFCI breaker with:

1. Eaton D64RP410 (UL 1053) + C311CT35 CT
2. 2-pole breaker with shunt-trip

Operation: CT monitors both hots, D64RP410 detects residual current, closes aux contact, trips the breaker. Trip 30 mA–6 A, control 24–240 V AC/DC
All components are UL-listed.

Is this acceptable under NEC as a replacement for a UL 943 GFCI breaker? Any code considerations I should know?

Thanks!
 
What type of GF protection do you need, personnel or equipment? It is unlikely you can build your own GFCI.

The QO breaker is a Class A device with a pickup point of 5mA and opening which follows a specific time current curve defined by the UL standard for GFCI.

Do you know the trip curve of your relay and the opening time delay for the shunt trip on the breaker
 
ohad said:
Is this acceptable under NEC as a replacement for a UL 943 GFCI breaker? Any code considerations I should know?
Click to expand...
No. Not listed for UL 943, much less circuit shutdown.

Eaton shows D64RP410 as DIN rail device. Here is the manual

The IEC 62020-1 listing specifically applies to residual current monitors (RCMs) with alarms, rather than circuit shutdown of residual current devices (RCDs), governed by different standards, such as IEC 60755.

NEC violations would be 110.3(B), among other sections governing 2-Pole appliances, and occupancy areas.

Eaton's listed UL 943 replacement for QO240GFCI is CHQ240GF, which fits Sq-D QO equipment, and is a Class-A GFCI that shutdown at 4-6mA
 
this D64RP410 can use both industrial and personal use, it can measure 6-30ma.
trip time from D64RP410 signal to cb trip is 5milisec.
need to know if this safety related and can be approved?.

now i have this: QO240GFI for home or dedicated socket use .
and this : QOB250EPD for industrial use .
this devices design to install in special panel with bus bars of hot lines and natural bus, i want to connect like this QOB250EPD
but with wires in control panel (din rail is better )
input wires: 2 hot wires of 120v to ground.

​

 
It is _possible_ to get the combination of a ground fault sensor and a separate contactor or shunt trip approved as a 'GFCI'. I don't know the specifics of getting such and approval, and have never needed to do so. I'm sure it is not cheap.

I know it is possible because the Leviton 8895 had just this sort of approval. Per the datasheet, an 8895 combined with one of a list of approved contactors met UL standard 943 for GFCIs. https://www.biaonline.com/catalog/pdfsline/L010/L01000/8895-80.pdf

IMHO if you had an application where you _needed_ to 'roll your own' GFCI, you should find a ground fault relay that already has the necessary UL approvals to work with an approved list of shunt trip breakers as a GFCI.

If on the other hand you happen to have a ground fault relay and are wondering if you can use it as a GFCI, my answer would be 'probably not'. The _usual_ use of a ground fault relay is not as a GFCI for personnel protection, but for other sorts of ground fault detection/protection. Things such as ground fault protection of equipment or similar
 
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