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Phase Failure Relays

Type MP

Class 8430 / Refer to Catalog 8430CT9701

The Class 8430 phase failure relays offer the reliability and accuracy of solid state circuitry with the isolation of hard output contacts.

Phase Abnormality Definitions

Phase Loss: This condition occurs when one line of a 3 phase system is completely lost.

Phase Unbalance: This condition occurs when the voltage in one line of a 3 phase system drops below the voltage in the remaining two lines.

Phase Reversal: This condition occurs when two of three lines in a 3 phase system are switched. This incorrect connection will cause a motor to rotate in the reverse direction.

Undervoltage: This condition occurs when the voltage in all three lines of a 3 phase system drop simultaneously.

 

Table 23.192:

Class/Type	Protects Against				Description	Contact Arrangement	Nominal Voltage	Type	$ Price
	Phase Loss	Phase Unbalance	Phase Reversal	Under Voltage
8430 MPS	Yes	Yes	Yes	Yes	Phase Failure and Undervoltage Relay The Type MPS is a socket mounted, voltage sensing phase failure relay. The undervoltage setting is adjustable from 75% to 100% of normal voltage. The relay is UL Listed with the appropriate socket (see socket selection on page 23-16). The 240 V rated, SPDT output contacts change state upon phase failure, undervoltage, phase reversal or phase unbalance of 10% or greater. Response time delay is 3 seconds.	SPDT	240–60	MPSV24	219.00
							480–60	MPSV29
8430 MPD	Yes	Yes	Yes	Yes	Phase Failure and Undervoltage Relay The Type MPD offers the same protection as the Type MPS plus the following features: DPDT 600 V rated output contacts, locking potentiometer undervoltage adjustment and an LED indicating “relay energized.” Can be mounted directly to a panel or to 8501 XM track (see page 23-26).	DPDT	120–60	MPDV20	488.00
							240–60	MPDV24
							480–60	MPDV29
							600–60	MPDV32

For 8430 MPS Sockets, see page 23-16.

Table 23.193:

Operating Data

Power Consumption	Type MPS	5.5 VA
	Type MPD	7 VA
Ambient Temperature		+23oF to 122oF -5oC to 50oC
Devices are auto reset, so 3 wire control should be used to accomplish safe operation of equipment.

 

 

MPS:		File E42240 CCN NLDX provided the proper socket is used. 8430MPSV24 - 8501 NR51 or NR52 socket (see page 23-16). 8430MPSV29 - 8501 NR82 socket (see page 23-16).			File E42240 CCN NLDX2 without using the sockets listed.		File LR60905 -174
MPD:		File E42240 CCN NLDX

 

Table 23.194:

Contact Ratings

Type	Contacts	Maximum Control Circuit Voltage	AC Ratings
			Inductive		Resistive
			Make VA	Break VA	Make & Break Amperes	Thermal Continuous Current
MPS	SPDT	120 240	1800 1800	180 180	5 5	5  5
MPD	DPDT	120 240 480 600	3400 3600 3600 3600	340 360 360 360	5 5 2.5 2.5	5  5  5  5

 

Table 23.195:

How to Order

To Order Specify:	Catalog Number
▪ Class Number ▪ Type Number ▪ Voltage Code	Class	Type	Voltage Code
	8430	MPS	V24

 

CP1	Discount Schedule

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Related Topics

For Mounting Track for the 8430 MPS relays page 23-26