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 © Air Products and Controls Inc. 2013   25 Corporate Drive   Auburn Hills, MI 48326   Ph. (248) 332-3900   Fax (248) 332-8807   www.ap-c.com

MR-310 SERIES 

LOW VOLTAGE, LOW CURRENT 

OPTO-ISOLATED RELAY INSTALLATION GUIDE

PRODUCT SPECIFICATIONS

VOLTAGE REQUIREMENTS:

AMBIENT TEMPERATURE:

CONTACT RATINGS:

TRIP:

 5 - 27.3VDC    

       HOST:

 12 - 27.3VDC  

Resistive load: 10A @ 120VAC, 7A @ 24VDC/VAC; Inductive load: 0.35 PF (Power Factor)

CONTACT CONSTRUCTION:

WIRING:

“/C” VERSIONS:

Backbox: 18ga CRS, plated with ½" conduit knockouts top and bottom

MR-311, MR-321: plastic ABS 94V-0 (“/C” Grey, “/C/R” Red)

MR-312, MR-313, MR-322, MR-323: 18ga CRS (“/C” Grey, “/C/R” Red) 

POLARIZED INPUT(S):

Yes, on both trip optoisolator and host coil inputs 

32ºF to 120ºF (0ºC to 49ºC) @ 93% RH (@ 32     ), Non-Condensing / Non-Freezing 

     

“/T” VERSIONS:

“/S” VERSIONS:

3.5" wide, low profile snap track provided with mounting screws

Aluminum spacers provided with #8 X 7/8" mounting screws

ºC

Solid or stranded: #14 to #22 AWG terminals

ENERGIZED INDICATOR:

CURRENT REQUIREMENTS:

HOST VDC:

12.0VDC

13.2VDC

18.4VDC

18.5VDC

19.2VDC

24.0VDC

26.4VDC

27.3VDC

MR-310

36.0mA

37.0mA

40.0mA

38.0mA

39.0mA

42.0mA

44.0mA

46.0mA

MR-320

69.0mA

70.0mA

73.0mA

56.0mA

58.0mA

74.0mA

76.0mA

79.0mA

J3 IN

J3 OUT

TRIP VDC:

    

5.0VDC 

9.0VDC

9.6VDC

12.0VDC

13.2VDC

18.4VDC

18.5VDC

19.2VDC

24.0VDC

26.4VDC

27.3VDC   

J1 IN

3.2mA

7.1mA

7.7mA

10.0mA

11.2mA

17.0mA

2.1mA

2.2mA

2.8mA

3.2mA

3.3mA

J1 OUT

2.5mA

5.6mA

6.0mA

7.8mA

8.8mA

13.0mA

2.0mA

2.1mA

2.7mA

3.1mA

3.2mA

J2 IN

J2 OUT

TRIP+  TRIP-  HOST+  HOST-  

J1

J2

J3

ON

IN: Inductive/ Resistive load type

OU
T: Resistive load type

IN:

 T

rip volt.   18.4VDC

OU
T: T

rip volt.   18.5VDC

IN: Host volt.   18.4V

DC

OU
T: Host volt.   18.5V

DC

2J

3J

J1

TRIP+  TRIP-  HOST+  HOST-  

J2

J3

ON

IN: Inductive/ Resistive load type

OU
T: Resistive load type

IN:

 T

rip volt.   18.4VDC

OU
T: T

rip volt.   18.5VDC

IN: Host volt.   18.4VDC

OU
T: Host volt.   18.5VDC

3J

1J

J1

J3

2J

     

C

N

K1

K2

K1

MR-310 SERIES

SPDT Contacts

Resistive: 10A @ 120VAC,

7A @ 24VDC/VAC

Inductive: 0.35 PF (Power Factor)

MR-320 SERIES

DPDT Contacts

Resistive: 10A @ 120VAC,

7A @ 24VDC/VAC

Inductive: 0.35 PF (Power Factor)

Triggering Power 

InputTRIP:

 5-27.3VDC @ 

2.0-17mA (Min.- Max.)* 

(Polarized)

TriggeringPower Input 

TRIP:

 5-27.3VDC @

2.0-17mA (Min.- Max.)* 

(Polarized)

OperatingPower Input 

HOST:

 12-27.3VDC @

36-46mA (Min.- Max.)* 

(Polarized)

Operating Power Input 

HOST: 

12-27.3VDC @

56-79mA (Min.- Max.)* 

(Polarized)

*Refer to application specific jumper configuration programming guide (on reverse) for precise current draw requirements. Relay is shipped with J1, J2, and J3 

installed in the “OUT” positions. You must program all jumpers for the proper load type and specific voltages in your application to guarantee proper relay operation.  

MR-320 SERIES 

TRIP INPUT CURRENT DRAW

HOST INPUT CURRENT DRAW

Cover Material:

APPROVALS:

     C

NO     

     

C

N

     C

NO     

     

C

N

     C

NO     

WIRING

(TYPICAL FOR ONE 

MODULE POSITION)

“/S” and “/T” versions: 

 

(UL864: UOXX2, UUKL2)

(UL2017: UEHX2) (UL916: PAZX2) (UL508: NMTR2, NMTR8)

“/C” versions: 

UL Listed File #S3403 

(UL864: UOXX, UUKL) (UL2017: UEHX)

(UL508: NMTR, NMTR7) (UL916: PAZX)

“C/R” versions: 
Listed Versions: 

RELAY OUTPUTS UL LISTED FOR 

“COMMON” USE

NOTE:

 THE INPUT CURRENT SHALL NOT EXCEED THE MARKED RATING OF THE PRODUCT

INST APD0217 D140410 

Issue 1

One red LED per module position

Dry form “C” 

NOTE: LE COURANT D'ENTRÉE NE DOIT PAS DEPASSER LA COTE MARQUE DU PRODUIT

UL Recognized Component File #S3403

MEA 73-92-E Vol. 30
CSFM 7300-1004:111

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