COIL CHARACTERISTICS (Vdc) M550
CODE A B C N
Nominal operating voltage 28 12 6 28
Maximum operating voltage 29 14.5 7.3 29
Maximum pick-up voltage at +125° C 18 9 4.5 18
Maximum drop-out voltage at +125° C 7 4.5 2.5 7
Coil resistance W ±10% at +25° C 290 70 18 290
Back EMF suppressed to (Vdc) N/A N/A N/A -42

GENERAL CHARACTERISTICS
Temperature range -65°C to +125°C
Dielectric strength at sea level
- Contacts to ground and between contacts 1250 Vrms / 50 Hz
- Coil to ground 1000 Vrms / 50 Hz
Dielectric strength at altitude 25,000 m (all points) 350 Vrms / 50 Hz
Initial insulation resistance at 500 Vdc 100 M W min.
Sinusoidal vibration (except G, O and R mounting) 30G / 75 to 3000 Hz
Sinusoidal vibration (G, O and R mounting only) 20G / 75 to 3000 Hz
Shock (except G, O and R mounting) 200G / 6 ms
Shock (G, O and R mounting only) 50G / 11 ms
Maximum contact opening time under vibration and shock 10 µs
Operate time at nominal voltage 15 ms max
Release time 15 ms max
Bounce time 1 ms max
Contact voltage drop at nominal current
- initial value 150 mV max
- after life 175 mV max
Date of issue: 9/08 - 174 - Page 2 of 4