Best Double Pole Double Throw Relay 120V: Reliable DPDT Relays for Industrial and HVAC Systems
When selecting a double pole double throw (DPDT) relay for 110V/120V AC applications, reliability, contact rating, and mounting options are key. This guide highlights five DPDT-capable relays suited for industrial, HVAC, and control panel use. Each product features coil voltage compatibility around 110–120V AC or close variants, robust contact assemblies, and options for DIN rail or panel mounting. Review the summaries below to compare features, then explore in-depth product sections for installation considerations and use cases.
Summary of Selected Products
| Product | Brand | Coil Voltage | Contacts | Mounting |
|---|---|---|---|---|
| Electromagnetic Power Relay, DPDT | VAMRONE | 110V/120V AC | DPDT (2NO 2NC) | DIN Rail supported |
| T92P7D22-12 Power Relay, 2-Pack | Sonzrod | 12V DC | DPST-NO | Flange mount |
| Supco 90340 General Purpose Switching Relay | Supco | 24V | DPDT | Panel/Chassis mount (general use) |
| Weasch RGF2OU615, 25A 100-120VAC | Weasch | 100-120V AC | DPST – 2NO | General purpose compact |
| Casalytics RH2B-ULAC110-120V | Casalytics | 110/120V AC | DPDT | Plug-in, blade terminals |
Electromagnetic Power Relay DPDT by VAMRONE
The VAMRONE DPDT relay operates at 110V/120V AC coil voltage with a contact rating of 10A at 240VAC. It features eight terminals and supports DIN rail mounting, along with self-tapping screws for secure installation. The coil and contact arrangement provides two normally open and two normally closed contacts, enabling versatile control schemes for HVAC, motor control, and automation panels. This relay is suitable for DIN rail systems used in industrial environments and can act as a robust switch in complex control circuits.
Sonzrod T92P7D22-12 Power Relay Pack
The T92P7D22-12 is a 2-pack of 12V DC coil relays rated at 30A at 120VAC. While primarily described as DPST-NO, these relays provide strong load handling for HVAC controls, PLC interfaces, and automotive-relay replacements. The flange-mount design supports secure panel installation, and the relays are designed to withstand vibration and broad temperature ranges. This pair is ideal when spare relays are needed to minimize downtime in critical control loops.
Supco 90340 General Purpose DPDT Relay
The Supco 90340 is a DPDT general-purpose relay with a 24V coil. It is UL-recognized and CSA certified, indicating adherence to safety and quality standards for electrical controls. This relay is suitable for simple changeover switching in automation panels, signal relays for control signals, and other applications requiring two switching circuits in a compact package. It supports typical industrial wiring practices and is compatible with standard relay sockets and DIN rail assemblies when appropriate mounting accessories are used.
Weasch RGF2OU615 DPST Relay
The Weasch RGF2OU615 is a 25A 100-120VAC relay with a DPST – 2NO configuration. It features UL, TÜV, CE, and ROHS certifications for quality assurance, and uses a “double-break” contact structure to improve arc extinction and switching reliability across frequent operations. This model is well-suited for HVAC controls, motor drives, and machine panels needing robust, repeatable switching with strong current handling.
Casalytics RH2B-ULAC110-120V DPDT Relay
The Casalytics RH2B-ULAC110-120V is a DPDT relay rated for 110/120VAC operation with a 10A capacity. It features blade terminals for secure wiring and plug-in style compatibility. The relay adds flexibility for complex switching arrangements in control panels and automated systems, enabling two separate circuits to be controlled independently with a single device. It suits both new installations and field upgrades where DPDT functionality is needed in a compact form factor.
Buying Guide: Key Purchase Considerations
- Coil voltage compatibility: Match coil voltage to your control circuit. Common values around 110V–120V AC, 12V DC, and 24V DC are widely available; ensure the coil rating suits your control transformer or driver outputs.
- Contact configuration: DPDT relays provide two independent changeover circuits, enabling more complex switching. If your application requires two simultaneous switching paths, DPDT is advantageous; otherwise, DPST or SPDT configurations may suffice.
- Current and voltage ratings: Check the load current (amperage) and the maximum switching voltage. For HVAC, motors, and pumps, 10A–30A at 110–240VAC is common; ensure the relay can safely handle peak inrush currents.
- Mounting method: DIN rail, panel, flange, or plug-in options affect installation. DIN rail relays offer quick mounting in control enclosures, while flange or plug-in types provide rugged field applications.
- Certifications and safety: UL, TÜV, CE, and ROHS certifications indicate compliance with industry safety and environmental standards. Use certified models for critical equipment.
- Durability and environment: Look for wide operating temperature ranges and resistance to vibration or corrosion if the relay will operate in harsh environments or automotive/hvac settings.
- Diagnostics features: LED indicators and protective covers help monitor operation and protect personnel during maintenance. LED status is useful for quick fault isolation.
- Compatibility with existing sockets: If you’re replacing a relay, confirm pinout and terminal arrangement to avoid rewiring or socket changes.
- Lifecycle and maintenance: Some relays include improved arc suppression via double-break contacts or robust contact alloys. Consider long-term reliability if the relay will switch frequently.