P74x/EN TD/N
1, P742, P743 (TD) 2-
Power Supply Interruption
Per IEC 60255-11: 1979
The relay will withstand a 20ms interruption in
the DC auxiliary supply, without
de-energising.
Per IEC 61000-4-11: 1994
The relay will withstand a 20ms interruption in
an AC auxiliary supply, without de-
energising.
Note: the use of a E124 extends these limits
Battery Backup
Front panel mounted
Type ½ AA, 3.6 V
Field Voltage Output
Regulated 48 Vdc
Current limited at 112 mA maximum output
Digital (“Opto”) Inputs
Universal opto inputs with programmable
voltage thresholds. May be energised from the
48 V field voltage, or the external battery
supply.
Rated nominal voltage: 24 to 250 Vdc
Operating range: 19 to 265 Vdc
Withstand: 300 Vdc.
Nominal pick-up and reset thresholds:
Pick-up: approx. 70 % of battery nominal set,
Reset: approx. 66 % of battery nominal set.
Recognition time: 7 ms
Output Contacts
Standard Contacts
General purpose relay outputs for signalling,
tripping and alarming:
Rated voltage: 300V
Continuous current: 10A
Short-duration current: 30A for 3s
Making capacity: 250A for 30ms
Breaking capacity:
DC: 50W resistive
DC: 62.5W inductive (L/R = 50ms)
AC: 2500VA resistive (cos φ = unity)
AC: 2500VA inductive (cos φ = 0.7)
Response to command: < 5 ms
Durability:
Loaded contact: 10 000 operations
minimum,
Unloaded contact: 100 000 operations
minimum.
Fast operation and High Break Contacts
Dedicated purpose relay outputs for tripping:
Uses IGBT technology
Make and Carry: 30 Amps for 3 sec,
30A @ 250V resistive
Carry: 250 Amps dc for 30ms
Continuous Carry: 10 Amps dc
Break Capacity:
– 10A @ 250V resistive (10,000 operations)
– 10A @ 250V L/R=40ms
Operating time:
<200µs
& Reset time: 7.5ms
Watchdog Contacts
Non-programmable contacts for relay
healthy/relay fail indication:
Breaking capacity:
DC: 30 W resistive
DC: 15 W inductive (L/R = 40 ms)
AC: 375 VA inductive (cos φ = 0.7)
IRIG-B 12X Interface (Modulated)
External clock synchronization per IRIG
standard 200-98, format B12X.
Input impedance 6kΩ at 1000Hz
Modulation ratio: 3:1 to 6:1
Input signal, peak-peak: 200mV to 20V
IRIG-B 00X Interface (Un-modulated)
External clock synchronization per IRIG
standard 200-98, format B00X.
Input signal TTL level
Input impedance at dc 10kΩ
Environmental Conditions
Ambient Temperature Range
Ambient temperature range
Operating temperature range:
–25°C to +55°C
(or –13°F to +131°F)
Storage and transit:
–25°C to +70°C
(or –13°F to +158°F)
Tested as per
IEC 60068-2-1: 2007:
storage (96 hours) –25°C (–13°F)
operation (96 hours) –40°C (–40°F)
IEC 60068-2-2: 2007:
storage (96 hours) +85°C (+185°F)
operation (96 hours) +85°C (+185°F)
Ambient Humidity Range
Per IEC 60068-2-3: 1969:
56 days at 93 % relative humidity
and +40 °C
Per IEC 60068-2-30: 1980:
Damp heat cyclic, six (12 + 12) hour cycles,
93 % RH, +25 to +55 °C
Corrosive Environments
Per IEC 60068-2-60: 1995, Part 2, Test Ke,
Method (class) 3
Industrial corrosive environment/poor
environmental control, mixed gas flow test.
21 days at 75% relative humidity and +30°C
Exposure to elevated concentrations of H
2
S,
NO
2
, Cl
2
and SO
2
.
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