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Appendix 2. 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® 752A 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 by using 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 which is connected in series with the
Terranova® relay.
