Quantity   Component name
2 × Relay 12 or 24 Volt DC coil, SPDT contacts Remote relay, both same DC coil voltage
1 × Bridge Rectifier Provides Polarity for Remote relays and spike absorbing diodes
1 × DC power supply 12 or 24 volts to match relay volts Local DC power source to provide the power for all 3 relays
1 × Relay 12 or 24 Volt DC coil, DPDT contacts Local relay to provide polarity reversal
1 × 1N4002 Diode Spike absorbing diode across the local DPDT relay coil