HV Vacuum / Gas-Filled Technology
Hermetically sealed contact chamber
Consistent arc extinction independent of ambient humidity, pressure or dust.
High dielectric strength
Minimises leakage in the open state — critical for HV safety coordination.
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Sensata | Gigavac · PRODUCT SERIES
SPST-NO High Voltage Relays — Single-Pole, Normally-Open Contact
15 models · 5-70 kVdc switching · 5-110 A continuous · Hermetic / vacuum construction · Test equipment, ATE, energy routing
The GIGAVAC SPST-NO family delivers single-pole, normally-open (1 Form A) high voltage relays. The contact is open with the coil de-energised and closes on energisation — the canonical switching element for HV test systems, ATE, pre-charge and energy-routing applications.
Hermetic / vacuum construction enables a wide switching range from 5 kVdc up to 70 kVdc and continuous current from 5 A to 110 A. Coil options include 12 / 26.5 / 115 Vdc with bus wire, turret terminal and flying leads variants.
Where a latching variant of the same frame exists, the model card shows a cross-link; the configurator generates the original Sensata part-no automatically based on contact / coil / mount selections.
HV Test EquipmentATE (Automatic Test)Hipot / Insulation TestingHigh Voltage Power SwitchingEV Pre-charge & Battery TestX-Ray & Medical DevicesScientific InstrumentationEnergy Routing
SERIES CERTIFICATIONS04APPROVALS
- Hermetik / Vakum
- RoHS
- REACH
- CE
Certifications vary by model — see the corresponding model datasheet for details.
HERMETIC · 1 FORM ASPST-NO HV RELAYSENSATA
Models
13
Products
129
- 01Max. Switching Voltage
- 70 kVdc
- 02Max. Continuous Current
- 110 A
- 03Contact Configuration
- 1 Form A · NO
- 04Model Count
- 15 models
SHARED ACROSS ALL MODELSContact Form:SPST-NOContact Form:Form ACoil Voltage:12 / 26.5 / 115 VdcConnection Types:Bus Wire · Turret · Flying Leads · SolderMounting:Through-panel · Flange · Threaded · StdConstruction:Hermetic / vacuum ceramic body
01
SPST-NO High Voltage Relays / Form A Contact
11 MODELS123 PRODUCTS
| CONFIGURATOR | MODEL↑ current | Contact Voltage (kV) | Continuous Current (A) | Mounting Types | |
|---|---|---|---|---|---|
G41A | 5kV | 30 | 3-hole Flange, Std Flange | Datasheet (PDF) — G41A | |
CONFIGURATOR · G41AMODEL-SPECIFIC | |||||
G47A | 8kV | 12 | 3-hole Flange, Std Flange | Datasheet (PDF) — G47A | |
G43A | 10kV | 25 | 3-hole Flange, Std Flange | Datasheet (PDF) — G43A | |
G81A | 10kV | 5/10 | Panel Mount, PC Board | Datasheet (PDF) — G81A | |
G22 | 25kV | 65 | Through Panel | Datasheet (PDF) — G22 | |
G28 | 25kV | 30 | Through Panel | Datasheet (PDF) — G28 | |
G62A | 25kV | 18 | Threaded | Datasheet (PDF) — G62A | |
G20 | 28kV | 110 | Through Panel | Datasheet (PDF) — G20 | |
G61A | 35kV | 10 | Threaded | Datasheet (PDF) — G61A | |
G64A | 50kV | 10 | Threaded | Datasheet (PDF) — G64A | |
G71A | 70kV | 10 | Threaded | Datasheet (PDF) — G71A | |
02
Latching Models
2 models · Holds state without continuous coil power
2 MODELS6 PRODUCTS
| CONFIGURATOR | MODEL | Contact Voltage (kV) | Continuous Current (A) | Mounting Types | |
|---|---|---|---|---|---|
G61LA | 35kV | 10 | — | Datasheet (PDF) — G61LA | |
G71LA | 70kV | 10 | — | Datasheet (PDF) — G71LA |
TECHNICAL DIFFERENTIATORS
Why SPST-NO Series?
Wide HV Range
5 kV — 70 kV voltage range
From low HV (G81A, G47A) to ultra-high voltage (G71A) under the same contact philosophy.
5 — 110 A continuous current scale
Single family covering test equipment (G81A, 5/10 A) up to main power (G20, 110 A).
Latching Alternatives
G61LA · G71LA pulse-latching
For low-power, portable or battery-backed HV systems where continuous coil energy is undesirable.
Fail-Safe Open State
Open on coil power loss
System defaults to safe disconnect — natural fit for main HV switches.
Conduction on command
Closes the circuit only when the supervisory system explicitly commands it.
Flexible Coil Configuration
12 / 24 / 48 / 110 Vdc coil options
Directly compatible with common industrial and mobile DC bus voltages.
Economiser / pull-in profiles
On selected models hold-current is reduced for lower long-term coil consumption.
DATASHEET · GUIDE · APPLICATION NOTE
SPST-NO Series — Technical Resources
Datasheets
- GIGAVAC HV Relay — SPST-NO Family Datasheet Set (G20, G22, G28, G41A, G43A, G47A, G61A, G62A, G64A, G71A, G81A)SOON
- Latching Form A Datasheets — G61LA · G71LASOON
Selection Guides
- GIGAVAC HV Relay Selection Guide — SPST-NO vs SPST-NC vs SPDTSOON
- Form A Selection Flow — Voltage, Current, Coil, Pre-chargeSOON
Application Notes
- HV Switching Topologies in EV Test EquipmentSOON
- Pre-charge Circuit Design for Capacitive LoadsSOON
FREQUENTLY ASKED QUESTIONS
About the SPST-NO series
06/06
RELATED INSIGHTS · SPST-NOREF · IMB · PUB · 01 ENTRIES
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