Using Surge Suppressors - Allen-Bradley SLC 500 1747-L20 Instrucciones De Instalación

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Relay Contact Ratings
Maximum Amperes
Volts
Make
240V ac 7.5A
120V ac 15A
125V dc 0.22A
24V dc 1.2A
To calculate make and break ratings for other load voltages, divide the volt-ampere
rating by the load voltage. For example:

Using Surge Suppressors

Inductive load devices such as motor starters and solenoids require the use of some
type of surge suppression to protect the controller output contacts. Switching
inductive loads without surge suppression can significantly reduce the lifetime of
relay contacts. By adding a suppression device directly across the coil of an inductive
device, you will prolong the life of the switch contacts. You will also reduce the
effects of voltage transients caused by interrupting the current to that inductive
device, and will prevent electrical noise from radiating into system wiring.
SLC 500™ Fixed Hardware Style Controllers
Amperes
Continuous
Break
0.75A 2.5A
1.5A
1.0A
2.0A
28 VA
----------------- 0.583 A =
48V dc
Volt-amperes
Make Break
1800 VA 180 VA
28 VA
28 VA
Publication 1747-IN008B-MU-P
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