Specifications

Publication 1747-SG001E-EN-E - February 2013
16 Select SLC 500 I/O Modules
(6) Surge current = 35 A per common for 10 ms.
Relay Output Modules
Specifications 1746-OW4
1746-OW8
(2)
1746-OW16
(2)
1746-OX8
(2)
Number of outputs 4 8 16 8
Points per common 4 4 8 Inidvidually isolated
Voltage category AC/DC Relay
Operating voltage range 5…125V DC
5…265V AC
Backplane current (mA) @ 5V 45 mA 85 mA 170 mA 85 mA
Backplane current (mA) @ 24V 45 mA 90 mA 180 mA 90 mA
Load current, min 10 mA @ 5V DC
Leakage current, off-state output, max 0 mA 0 mA 0 mA 0 mA
Signal on delay, max (resistive load) 10 ms 10 ms 10 ms 10 ms
Signal off delay, max (resistive load)
10 ms 10 ms 10 ms 10 ms
Continuous current per point
(1)
See relay contact ratings
Continuous current per module 8.0 A AC
8.0 A/Common
16.0 A AC
8.0 A/Common
(3)
(1) Recommended surge suppression: For triac outputs when switching 120V ac inductive loads, use Harris Metal-oxide Varistor, model number V220MA2A. Refer to the
SLC 500 Modular Hardware Style User Manual, publication 1747-UM011
for more information on surge suppression.
(2) Certified for Class 1 Div 2 Hazardous Locations by CSA.
(3) Limit continuous current per module so that module power does not exceed 1440 VA.
Relay Contact Ratings
Catalog Number Maximum Volts
Amperes
(1)
Amperes
(3)
Continuous
Volt-Amperes
Make Break Make Break
1746-OW4
1746-OW8
1746-OW16
AC 240V AC 7.5 A 0.75 A 2.5 A 1800 VA 180 VA
120V AC 15 A 1.5 A
DC 125V DC
0.22 A
(2)
1.0 A 28 VA
24V DC
1.2 A
(2)
2.0 A
1746-OX8 AC 240V AC 15 A 1.5 A 5.0 A 3600 VA 360 VA
120V AC 30 A 3.0 A
DC 125V DC
0.22 A
(2)
1.0 A 28 VA
24V DC
1.2 A
(2)
2.0 A
(1) Connecting surge suppressors across your external load extends the life of SLC 500 relay contacts. For recommended surge suppression when switching ac
inductive loads, consult the SLC 500 Modular Hardware Style User Manual, publication 1746-UM011. Recommended surge suppression for switching 24V dc
inductive loads is 1N4004 diode reverse wired across the load.
(2) For dc voltage applications, the make/break ampere rating for relay contacts can be determined by dividing the 28 VA by the applied dc voltage. For example,
28 VA/48V DC= 0.58 A for DC voltage applications less than 14V, the make/break ratings for relay contacts cannot exceed 2 A.
(3) The continuous current per module must be limited so the module power does not exceed 1440 VA.