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Appendix 5. Notes on Terranova® Set Point Relays
Figure 1
. Heavy Duty Type AZ5 relay voltage-current relationship
The Heavy Duty Type AZ5 relay is used in the Terranova® 907 to control external functions. As shown in
Figure 1
, maximum current
varies from 2 A at 30 V DC (60 V AC) to 0.4 A at 150 V DC (300 V AC) for resistive loads.
Protective Circuits for Inductive Loads
A protective circuit or component is recommended when switching inductive loads to suppress sudden voltage spikes. One method
to suppress high voltage spikes in an AC circuit is through the use of a
“snubber” circuit.
A “snubber” circuit
consists of a capacitor
and resistor across an inductive load. As shown in
Figure 2
, the “snubber” circuit is parallel to the
load.
