2-2 Specifications Date Code 20000421
SEL-251, -2, -3 Instruction Manual
Optoisolated Inputs
The SEL-251 available input ratings are different for the three chassis types.
The nominal input rating is not field adjustable - it is determined at the time of
order, and is identical for all six inputs. The inputs are not polarity dependent.
Conventional Terminal Blocks – SLP chassis (5 A nominal current inputs)
Nominal
Input Rating
Operating
Range
Burden at
Rated Voltage
Level Sensitive?
24 Vdc 15 – 30 Vdc 4 mA No
48 Vdc 30 – 60 Vdc 4 mA No
125 Vdc 100 – 150 Vdc 6 mA Yes, off below 75 Vdc
250 Vdc 150 – 300 Vdc 4 mA No
Conventional Terminal Blocks – LP chassis (1 A nominal current inputs)
Nominal
Input Rating
Operating
Range
Burden at
Rated Voltage Level Sensitive?
24 Vdc 15 – 30 Vdc 4 mA No
48 Vdc 30 – 60 Vdc 4 mA No
125 Vdc 80 – 150 Vdc 4 mA No
250 Vdc 150 – 300 Vdc 4 mA No
Plug-In Connectors
Nominal
Input Rating
Operating
Range
Burden at
Rated Voltage Level Sensitive?
24 Vdc 15 – 30 Vdc 4 mA No
48 Vdc 38 – 60 Vdc 5 mA Yes, off below 29 Vdc
125 Vdc 100 – 150 Vdc 6 mA Yes, off below 75 Vdc
250 Vdc 150 – 300 Vdc 4 mA No
Power Supply
24/48 Volt: 20 - 60 Vdc; 125/250 Volt: 85 - 350 Vdc or 85 - 264 Vac
10 watts nominal, 14 watts max. (all output relays energized)
Communications
Two EIA-232 serial communications ports, Port 2 of the SEL-251 Relay has
front- and rear-panel connectors.
Dimensions
See Figure 6.3 for SLP chassis models (5-amp nominal current inputs)
See Figure 6.5 for LP chassis models (1-amp nominal current inputs)
Time Code Input
Relay accepts demodulated IRIG-B time code input
Mounting
Available in horizontal and vertical mounting configurations
Dielectric Strength
V, I inputs: 2500 Vac for 10 seconds
Other: 3000 Vdc for 10 seconds (excludes EIA-232)
Routine Tested.
Operating
Temperature -40°F to 158°F (-40°C to 70°C)
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