AZ983-1A-12DE 80A RELAY (USED)
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The AZ983-1A-12DE is a heavy-duty, automotive-grade Power Relay manufactured by Zettler. It is highly specialized for high-current DC applications where reliability under extreme temperature and vibration is required.
AZ983: The series designation for Zettler’s high-current automotive relays.
1A: Contact Form — SPST-NO (Single Pole Single Throw, Normally Open).
12: Coil Voltage — 12V DC.
D: Coil Sensitivity — Typically represents a standard power coil (approx. 1.6W).
E: Seal Version — Usually indicates an Epoxy Sealed construction, making it resistant to moisture and environmental contaminants.
This relay is designed to bridge the gap between standard automotive relays and heavy-duty industrial contactors.
| Feature | Specification |
| Contact Rating | 80A (Continuous) at 14VDC |
| Max Switching Current | Up to 150A (Short duration/Inrush) |
| Contact Material | Silver Tin Oxide (AgSnO_2) |
| Max Switching Power | 1,120 W @ 14V INPUT |
| Operational Life | 10,000,000 operations (Mechanical) |
Terminal Configuration
The AZ983 series uses a "Mini-ISO" footprint but with upgraded terminal sizes to handle the 80A load.
Terminals 85 & 86: Small blades for the 12V DC Coil.
Terminals 30 & 87: Extra-wide (typically 9.5mm) high-current blades.
30: Battery/Power Input.
87: Load Output.
Since you are working with an EE55 2kW Inverter design, this relay is one of the best choices for the DC Input side.
Main Power Isolation: At 24V, this relay can safely handle the current for a 1,500W–1,800W load. If you are using a 12V system, it is perfectly rated for up to 1,000W continuous.
Pre-Charge Bypass: In a 2kW system, connecting the battery directly causes a massive spark (inrush current) that damages the capacitors and connectors. This relay can be timed to "click in" after a resistor has safely pre-charged the DC bus.
High-Current Battery Charger: For your EE55 30A Charger, this relay acts as a reliable physical disconnect to ensure no "back-feeding" occurs from the battery to the charger when it is powered off.
Critical Installation Checklist
Heat Dissipation: Even though it is rated for 80A, the terminals can get extremely hot. Use heavy-gauge copper lugs or $9.5\text{mm}$ high-temp female receptacles.
Snubber Diode: Like all inductive coils, you must place a diode (e.g., 1N4007) across terminals 85 and 86 to prevent the voltage spike from damaging your control circuit (especially if using an EGS002 or Arduino).
Mounting: This relay is often available with a metal or plastic mounting bracket. Secure it firmly to a chassis; at 80A, loose wires can vibrate and cause arcing.