Hardware reference guide

I/O Modules
646
35013379 11/2011
NOTE: Relay contact life for inductive loads may be significantly increased by using
external contact protection such as a clamping diode across the load.
Relay Contact Life
Mechanical Operations 10,000,000
Electrical Operations 200,000 (resistive load @ max voltage and current)
Electrical Operations (30 ...
150 Vdc) (see note below)
100,000, 300 mA (resistive load)
50,000, 500 mA (resistive load)
100,000, 100 mA (L/R = 10 msec)
100,000 Interposing Relay (Westinghouse Style 606B,
Westinghouse type SG, Struthers Dunn 219 x 13 XP)
Relay Type Form A
Contact Protection Varistor, 275 V (internal)
Isolation
Channel to Channel 1780 Vac rms for one minute
Field to Bus 1780 Vac rms for one minute
2500 Vdc for one minute
Bus Current Required 1100 mA
Power Dissipation 5.5 W + 0.5 x N = Watts (where N = the number of points on)
External Power Not required for this module
Fusing
Internal None
External User discretion
Specifications