Replacing a Square D (Schneider) 8430MPS or 8430MPD Phase Monitor Relay

Issue:

Schneider Electric (Square D) has obsoleted their complete line of 8430 MPS plug-in & MPD surface-mount phase monitor relays. I see Macromatic has several products I could use to replace the Square D products. Are there any special issues to address?

Solution/Resolution:

The following are the steps required to replace an obsolete Square D product with one from Macromatic:

8430MPS Series Plug-in

There were two voltage versions of 8430MPS products offered. The challenge in replacing them is the difference in their mounting configurations:

Voltage	8430	Wiring Configuration
240V	MPSV24 (1)	8 Pin Octal
480V	MPSV29 (2)	11 Pin Blade

⁽¹⁾Also sold as Grainger SKU #5B587
⁽²⁾Also sold as Grainger SKU #5B588

Macromatic has two products that can be used to replace the obsolete Square D 8430MPS plug-in relays: the PMPU & PMPU-FA8.

Both offer phase loss, phase reversal, adjustable undervoltage & voltage unbalance protection like the MPS products. However, they also offer overvoltage protection unlike the MPS units. The PMPU has more user-adjustments vs. fixed settings on the PMPU-FA8. Both can replace either the 240V & 480V versions of the Square D unit because they operate on any voltage from 190-500V (click here for additional information on the PMPU & PMPU-FA8 units):

To replace the 8430MPSV24 240V unit:

1. Remove the Square D 8430MPSV24 from the socket.
2. Rewire the socket per the diagram at right or on the side of the Macromatic unit.
3. Plug in the Macromatic PMPU or PMPU-FA8 product.
4. Set the PMPU or PMPU-FA8 to operate at 240V nominal line voltage. For additional set-up instructions, click here.
5. NOTE: both the PMPU & PMPU-FA8 come with optional manual reset option on Pins 6 & 7, which is not available with the MPS. Simply disregard these two Pins.

To replace the 8430MPSV29 480V unit:

1. Because the 8430MPSV29 unit uses an 11 pin blade socket & the Macromatic products use an octal socket, you must first install a new 8 pin octal socket.
2. Remove the 8430MPSV29 & mark all the wires currently connected to the 11 pin blade socket.
3. Remove the old socket & replace it with a 600V 8 pin octal socket, such as the Macromatic 70169-D (it must be a 600V-rated octal socket to be used on a 480V nominal voltage).
4. Reconnect the wires per the 8 pin octal socket drawing at right or on the side of the Macromatic unit.
5. Plug-in the Macromatic PMPU or PMPU-FA8 product.
6. Set the PMPU or PMPU-FA8 to operate at 480V nominal line voltage. For additional set-up instructions, click here.
7. NOTE: both the PMPU & PMPU-FA8 come with optional manual reset option on Pins 6 & 7, which is not available with the MPS. Simply disregard these two Pins.

8430MPD Series Surface-Mount

There were three voltage versions of 8430MPS products offered:

Voltage	8430	Wiring Configuration
240V	MPDV24
480V	MPDV29(3)
600V	MPDV32

⁽³⁾Also sold as Grainger SKU #5B589

The Macromatic PMDU product can replace both the 240V & 480V versions of the Square D unit because it operates on any voltage from190-500V.

The PMD575 can replace the 8430MPDV32 (click here for additional information on the PMDU & PMD575 units).

NOTE: The Square D 8430MPD unit has 600V DPDT output contacts while the Macromatic PMDU & PMD575 have 300V DPDT output contacts. Contact Macromatic for additional details.

To replace either the 8430MPDV24 240V or 8430MPDV29 480V unit:

1. Mark all the wires currently connected to the Square D unit.
2. Remove the Square D unit & replace with the Macromatic PMDU relay.
3. Reconnect the wires per the wiring diagram below or on the side of the Macromatic unit.
4. Set the PMDU to operate at 240V nominal line voltage if replacing the 8430MPDV24 or 480V nominal line voltage if replacing the 8430MPDV29. For additional set-up instructions, click here.
5. NOTE: the PMDU comes with optional manual reset option on Terminals M1 & M2, which is not available with the MPD. Simply disregard these two Terminals.

To replace the 8430MPDV32 600V unit:

1. Mark all the wires currently connected to the Square D unit.
2. Remove the Square D unit & replace with the Macromatic PMD575.
3. Reconnect the wires per the wiring diagram below or on the side of the unit.
4. For additional set-up instructions, click here.
5. NOTE: the PMD600 comes with optional manual reset option on Terminals M1 & M2, which is not available with the MPD. Simply disregard these two Terminals.

Please contact Macromatic Technical Support for additional information at 800-238-7474 or e-mail tech-help@macromatic.com.