Sel 551 - Specifications

1.4
SEL-551 Relay Instruction Manual Date Code 20110408
Introduction and Specifications
Specifications
Specifications
Section 1 In troduction and Specification s
General
AC Input Currents
5 A nominal: 15 A continuous, 500 A for 1 s,
linear to 100 A symmetrical.
Limiting Dynamic
Value :
1250 A for 1 cycle (sinusoidal
waveform)
Burden: 0.16 VA at 5 A
1.15 VA at 15 A
1 A nominal: 3 A continuous, 100 A for 1 s,
linear to 20 A symmetrical.
Limiting Dynamic
Value :
250 A for 1 cycle (sinusoidal
waveform)
Burden: 0.06 VA at 1 A
0.18 VA at 3 A
Power Supply
125/250 Vdc or Vac
Range: 85–350 Vdc or 85–264 Vac
Burden: <6.2 W
Interruption: 100 ms at 250 Vdc
Ripple: 100%
48/125 Vdc or 125 Vac
Range: 36–200 Vdc or 85–140 Vac
Burden: <5.5 W
Interruption: 100 ms at 125 Vdc
Ripple: 5%
24 Vdc
Range: 16–36 Vdc polarity dependent
Burden: <6.2 W
Interruption: 25 ms at 36 Vdc
Ripple: 5%
Note: Interruption and Ripple per IEC 60255-11:1979.
Output Contacts
Conventional Terminal Blocks Option:
Per IEC 255-0-20:1974, using the simplified method of assessment
Make: 30 A
Carry: 6 A continuous carry
1 s Rating: 100 A
MOV Protection: 270 Vac/360 Vdc
Pickup Time: <5 ms
Dropout Time: <5 ms
Breaking Capacity (10000 operations):
24 V 0.75 A L/R = 40 ms
48 V 0.50 A L/R = 40 ms
125 V 0.30 A L/R = 40 ms
250 V 0.20 A L/R = 40 ms
Cyclic Capacity (2.5 cycle/second):
24 V 0.75 A L/R = 40 ms
48 V 0.50 A L/R = 40 ms
125 V 0.30 A L/R = 40 ms
250 V 0.20 A L/R = 40 ms
Plug-In Connectors Option on SEL-551
(High Current Interrupting):
Make: 30 A
Carry: 6 A continuous carry
MOV Protection: 330 Vdc
Pickup Time: <5 ms
Dropout Time: <8 ms, typical
Breaking Capacity (10000 operations):
24 V 10.0 A L/R = 40 ms
48 V 10.0 A L/R = 40 ms
125 V 10.0 A L/R = 40 ms
250 V 10.0 A L/R = 20 ms
Cyclic Capacity (4 cycles in 1 second followed by 2 minutes idle
for thermal dissipation):
24 V 10.0 A L/R = 40 ms
48 V 10.0 A L/R = 40 ms
125 V 10.0 A L/R = 40 ms
250 V 10.0 A L/R = 20 ms
Note: Do not use high current interrupting output contacts to
switch ac control signals. These outputs are polarity dependent.
Note: Make per IEEE C37.90:1989; Breaking and Cyclic Capacity
per IEC 60255-23 [IEC 255-23]:1994.
Optoisolated Inputs
Note: The input type is dependent on the relay ordering options.
Level-sensitive inputs differ from jumper-selectable inputs in that
they are guaranteed to deassert below a certain voltage level and
they are not user-settable. The inputs are not polarity dependent.
With nominal control voltage applied, each input draws
approximately 4 mA of current.
Conventional Terminal Blocks Option
Note: The conventional terminal blocks model of the SEL-551 can
be ordered with either jumper-selectable voltage optoisolated
inputs or level-sensitive optoisolated inputs.
Jumper Selectable Control Voltage:
Both inputs may be individually user-configured to operate on
any of the following nominal voltages:
24 Vdc: on for 15–30 Vdc (also available on
the SEL-551C, but not jumper
selectable)
48 Vdc: on for 30–60 Vdc
125 Vdc: on for 80–150 Vdc
250 Vdc: on for 150–300 Vdc
Level-Sensitive:
Both inputs are factory configured for a fixed voltage level that
cannot be changed:
48 Vdc: on for 38.4–60 Vdc;
off below 28.8 Vdc
110 Vdc: on for 88–132 Vdc;
off below 66 Vdc
125 Vdc: on for 105–150 Vdc;
off below 75 Vdc
220 Vdc on for 176–264 Vdc;
off below 132 Vdc
250 Vdc: on for 200–300 Vdc;
off below 150 Vdc
Plug-In Connectors Option
Standard (Non-Level Sensitive):
24 Vdc: on for 15–30 Vdc
Level-Sensitive:
The plug-in connectors model is equipped with fixed “level-
sensitive” inputs. Both inputs are factory-configured to the
control voltage specified at the time of ordering:
48 Vdc: on for 38.4–60 Vdc;
off below 28.8 Vdc
110 Vdc: on for 88–132 Vdc;
off below 66 Vdc
125 Vdc: on for 105–150 Vdc;
off below 75 Vdc