1.14
SEL-751 Relay Instruction Manual Date Code 20170927
Introduction and Specifications
Specifications
Output Contacts
General
The relay supports Form A, B, and C outputs.
Dialectric Test Voltages: 2500 Vac
Impulse Withstand Voltage
(U
IMP
): 4700 V
Mechanical Durability: 100,000 no-load operations
Standard Contacts
Pickup/Dropout Time: 8 ms (coil energization to contact
closure)
DC Output Ratings
Rated Operational Voltage: 250 Vdc
Rated Voltage Range: 19.2–275 Vdc
Rated Insulation Voltage: 300 Vdc
Make: 30 A @ 250 Vdc per IEEE C37.90
Continuous Carry: 6 A @ 70°C
4 A @ 85°C
Thermal: 50 A for 1 s
Contact Protection: 360 Vdc, 40 J MOV protection across
open contacts
Breaking Capacity (10,000 Operations) per IEC 60255-0-20:1974:
24 Vdc 0.75 A L/R = 40 ms
48 Vdc 0.50 A L/R = 40 ms
125 Vdc 0.30 A L/R = 40 ms
250 Vdc 0.20 A L/R = 40 ms
Cyclic (2.5 cycles/second) per IEC 60255-0-20:1974:
24 Vdc 0.75 A L/R = 40 ms
48 Vdc 0.50 A L/R = 40 ms
125 Vdc 0.30 A L/R = 40 ms
250 Vdc 0.20 A L/R = 40 ms
AC Output Ratings
Maximum Operational
Voltage (U
e
) Rating: 240 Vac
Insulation Voltage (U
i
) Rating
(excluding EN 61010-1): 300 Vac
Contact Rating Designation: B300
Utilization Category: AC-15
Voltage Protection Across
Open Contacts:
270 Vac, 40 J
Fast Hybrid (High-Speed, High-Current Interrupting)
DC Output Ratings
Rated Operational Voltage: 250 Vdc
Rated Voltage Range: 19.2–275 Vdc
Rated Insulation Voltage: 300 Vdc
B300 (5 A Thermal Current, 300 Vac Max)
Maximum Current Max VA
Voltage 120 Vac 240 Vac —
Make 30 A 15 A 3600
Break 3 A 1.5 A 360
PF < 0.35, 50–60 Hz
AC-15
Operational Voltage (Ue) 120 Vac 240 Vac
Operational Current (Ie) 3 A 1.5 A
Make Current 30 A 15 A
Break Current 3 A 1.5 A
Electromagnetic loads > 72 VA, PF < 0.3, 50–60 Hz
Make: 30 A @ 250 Vdc per IEEE C37.90
Carry: 6 A @ 70°C
4 A @ 85°C
1 s Rating: 50 A
Open State Leakage Current: <500 µA
MOV Protection (maximum
voltage): 250 Vac/330 Vdc
Pickup Time: <50 s, resistive load
Dropout Time: <8 ms, resistive load
Breaking Capacity (10,000 Operations) per IEC 60255-0-20:1974:
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
Cyclic Capacity (4 cycles in 1 second, followed by 2 minutes idle for
thermal dissipation) per IEC 60255-0-20:1974:
48 Vdc 10.0 A L/R = 40 ms
125 Vdc 10.0 A L/R = 40 ms
250 Vdc 10.0 A L/R = 20 ms
AC Output Ratings
See AC Output Ratings for Standard Contacts.
Optoisolated Control Inputs
When Used With DC Control Signals
250 V: ON for 200.0–312.5 Vdc
OFF below 150 Vdc
220 V: ON for 176–275 Vdc
OFF below 132 Vdc
125 V: ON for 100.0–156.2 Vdc
OFF below 75 Vdc
110 V: ON for 88.0–137.5 Vdc
OFF below 66 Vdc
48 V: ON for 38.4–60.0 Vdc
OFF below 28.8 Vdc
24 V: ON for 15–30 Vdc
OFF below 5 Vdc
When Used With AC Control Signals
250 V: ON for 170.6–312.5 Vac
OFF below 106 Vac
220 V: ON for 150.2–275 Vac
OFF below 93.3 Vac
125 V: ON for 85–156.2 Vac
OFF below 53 Vac
110 V: ON for 75.1–137.5 Vac
OFF below 46.6 Vac
48 V: ON for 32.8–60 Vac
OFF below 20.3 Vac
24 V: ON for 14–30 Vac
OFF below 5 Vac
Current Draw at Nominal DC
Voltage:
2 mA (at 220–250 V)
4 mA (at 48–125 V)
10 mA (at 24 V)
Rated Impulse Withstand
Voltage (U
imp
): 4000 V
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