SPDT Relays
Single-pole double-throw high voltage relays.
- voltage_kv
- 3.5–70
- contact_form
- Form C
- current_a
- 5–150
CATEGORY
Discover IMB Electric's comprehensive selection of high voltage relays, engineered to meet the demanding requirements of critical high-power applications across diverse industrial sectors. Our robust high voltage (HV) relays provide safe, reliable, and efficient switching solutions for voltages ranging from 1 kV to an impressive 70 kV, and currents from 1 A up to a substantial 100 A. This expansive capability makes them ideally suited for a wide array of applications where precise control of high power is paramount. At the core of our HV relay offerings are advanced designs featuring both vacuum and SF6/N2 gas-filled ceramic envelopes. These construction methods are crucial for handling extremely high voltages and preventing arcing, ensuring long-term performance and enhanced safety. Vacuum relays are celebrated for their speed and exceptional dielectric strength, while SF6/N2 gas-filled relays offer superior heat dissipation and robust insulation under heavy loads, making them perfect for specific environments. IMB Electric's high voltage relays serve numerous vital industries. In test and measurement, they are indispensable for safely and accurately controlling power to sensitive equipment during rigorous testing procedures. The burgeoning electric vehicle (EV) fast charging infrastructure relies heavily on our HV relays for efficient and rapid energy transfer, enabling quicker turnaround times for EV owners. Battery energy storage systems (BESS) also utilize our relays for managing substantial power flows, playing a critical role in grid stability and renewable energy integration. Furthermore, our relays are ideal for high voltage direct current (HVDC) power transmission, where their reliability is paramount for efficient long-distance energy transfer. They also find extensive use in RF/microwave switching applications, ensuring signal integrity and power management in complex communication systems. Selecting the right high voltage relay involves careful consideration of several key parameters. Customers typically evaluate contact arrangement, which can include single-pole single-throw normally open (SPST-NO), single-pole single-throw normally closed (SPST-NC), single-pole double-throw (SPDT), and double-pole double-throw (DPDT) configurations, providing flexibility for various circuit designs. Many applications benefit from latching contact arrangements with magnetic hold, which maintain their state even after the control power is removed, offering energy efficiency and simplified control circuitry. Other crucial selection criteria include the required voltage and current ratings, environmental conditions, operational life expectancy (both electrical and mechanical), and the need for characteristics like low contact resistance for minimal power loss. IMB Electric distinguishes itself through its commitment to quality, performance, and immediate availability. Our high voltage relays are meticulously manufactured to ensure exceptional quality and reliability in even the most challenging environments. We understand the urgency of industrial projects, which is why a significant portion of our HV relay portfolio is shipped directly from stock, minimizing lead times and allowing you to maintain your project schedules. Partner with IMB Electric for your high voltage relay needs and experience the difference that expert engineering, broad applicability, and prompt service can make.
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Single-pole double-throw high voltage relays.

1.5 kV – 70 kV Single Pole Single Throw (SPST) high-voltage relay family — Vacuum, Reed and Gas-Filled technologies

3.5 kV – 35 kV Single Pole Double Throw (SPDT) high-voltage relay family

Single-pole, normally-open high voltage relays.
Mechanically latching high voltage relays with zero coil holding current.

SPDT high voltage relay (single-pole double-throw)

Single-pole, normally-closed high voltage relays.

15 kV – 70 kV magnetic latching high-voltage relay — Last-state preservation for energy savings
Double-pole double-throw high voltage relays.

5–50 kV · 5–110 A · SPST-NO high voltage relay

8 kV – 25 kV Double Pole Double Throw (DPDT) high-voltage relay — Two independent SPDTs on a single coil

SPST-NC high voltage relay (normally-closed)

DPDT high voltage relay (double-pole double-throw)
EDITORIAL
Selection guides, technical notes and brand news for this category.
Selecting high-voltage contactors requires a careful evaluation of rated current, breaking capacity, and arc protection to ensure system safety. Key factors including coil voltage, auxiliary contacts, and environmental durability are essential for reliable battery and EV applications.
Rated voltage (kV), continuous/inrush current, contact topology and coil type are the core criteria for HV relay selection.
In EV DC charging stations, main, pre-charge and isolation relays serve separate roles; bidirectional (V2G) capability is critical.
FAQ