Sel 751A - Specifications

1.20
SEL-751A Relay Instruction Manual Date Code 20100129
Introduction and Specifications
Specifications
Specifications
U.Instr uction Manual
General
AC Current Input
Phase and Neutral Currents
I
NOM
= 1 A, 5 A, 50 mA, or 2.5 mA (high sensitivity) secondary
depending on model.
INOM = 5 A
Rated Range (X/R = 40): 0.10–100.00 A
Continuous Rating: 15 A
1 Second Thermal: 500 A
Rated Frequency: 50/60 ±5 Hz
Burden (per phase): < 0.1 VA
INOM = 1 A
Rated Range (X/R = 40): 0.02–20.00 A
Continuous Rating: 15 A
1 Second Thermal: 100 A
Rated Frequency: 50/60 ±5 Hz
Burden (per phase): < 0.01 VA
INOM = 50 mA
Rated Range (X/R = 40): 5.0–1000.0 mA
Continuous Rating: 15 A
1 Second Thermal: 100 A
Rated Frequency: 50/60 ±5 Hz
Burden (per phase): < 2 mVA
INOM = 2.5 mA
Rated Range (X/R = 40): 0.13–12.50 mA
Continuous Rating: 15 A
1 Second Thermal: 100 A
Rated Frequency: 50/60 ±5 Hz
Burden (per phase): < 0.1 mVA
Measurement Category: II
AC Voltage Inputs
Rated Operating 100–250 Vac
Rated Continuous Voltage: 300 Vac
10 Second Thermal: 600 Vac
Rated Frequency: 50/60 ±5 Hz
Burden: < 0.1 VA
Power Supply
High-Voltage Supply
Rated Supply Voltage: 110–240 Vac, 50/60 Hz
110–250 Vdc
Input Voltage Range: 85–264 Vac
85–275 Vdc
Power Consumption: <40 VA (ac)
<20 W (dc)
Interruptions: 50 ms @ 125 Vac/Vdc
100 ms @ 250 Vac/Vdc
Low-Voltage Supply
Rated Supply Voltage: 24–48 Vdc
Input Voltage Range: 19.2–52.8 Vdc
Power Consumption: <20 W (dc)
Interruptions: 10 ms @ 24 Vdc
50 ms @ 48 Vdc
Output Contacts
General
OUT103 is Form C Trip Output, all other outputs are Form A.
Dielectric Test Voltage: 2000 Vac
Impulse Withstand Voltage
(U
imp
): 4000 V
Mechanical Durability: 10,000 no load operations
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 .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
Utilization Category: AC-15 (control of electromagnetic
loads > 72 VA)
Contact Rating Designation: B300 (B = 5 A, 300 = rated insulation
voltage)
Voltage Protection Across
Open Contacts: 270 Vac, 40 J
Rated Operational
Current (I
e
):
3 A @ 120 Vac
1.5 A @ 240 Vac
Conventional Enclosed
Thermal Current (I
the
)
Rating: 5 A
Rated Frequency: 50/60 ±5 Hz
Electrical Durability Make
VA Rating: 3600 VA, cos φ = 0.3
Electrical Durability Break
VA Rating: 360 VA, cos φ = 0.3