Flexible Coil Configuration
12 / 24 / 48 / 110 Vdc coil
Directly compatible with industrial and mobile DC bus voltages.
Optimised for continuous hold-open
Coil thermal design is rated for sustained energised operation.
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SPST-NC High Voltage Relays — Single-Pole, Normally-Closed Contact
11 models · 5-70 kVdc switching · 5-100 A continuous · Hermetic / vacuum construction · Fail-safe isolation, interlock, fault disconnect
The GIGAVAC SPST-NC family delivers single-pole, normally-closed (1 Form B) high voltage relays. The circuit stays closed while the coil is de-energised and opens on energisation — the canonical switching element for fail-safe isolation, safety interlocks and fault-driven automatic disconnection.
Hermetic / vacuum construction enables a wide switching range from 5 kVdc up to 70 kVdc and continuous current from 5 A to 100 A. Coil options include 12 / 26.5 / 115 Vdc with bus wire, turret terminal and flying leads variants.
Where an SPST-NO or 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.
Fail-Safe IsolationSafety InterlockHV Fault DisconnectEmergency Stop CircuitsEV Battery ProtectionHipot / Insulation TestingX-Ray & Medical DevicesScientific Instrumentation
SERIES CERTIFICATIONS09APPROVALS
- UL1604
- IP67
- IP69K
- SAE J1171
- ISO8846
- RoHS
- cRUus
- CE
- EPIC®
Certifications vary by model — see the corresponding model datasheet for details.
HERMETIC · 1 FORM BSPST-NC HV RELAYSENSATA
Models
11
Products
126
- 01Max. Switching Voltage
- 70 kVdc
- 02Max. Continuous Current
- 100 A
- 03Contact Configuration
- 1 Form B · NC
- 04Model Count
- 11 models
SHARED ACROSS ALL MODELSContact Form:SPST-NCCoil Voltage:12 / 26.5 / 115 VdcConnection Types:Bus Wire · Turret · Flying Leads · SolderMounting:Through-panel · Flange · Threaded · StdConstruction:Hermetic / vacuum ceramic body
01
SPST-NC Series 1 form b Contactor Models
Sorted by current rating (150A → 1000A)
11 MODELS126 PRODUCTS
| CONFIGURATOR | MODEL↑ current | Contact Voltage (kV) | Continuous Current (A) | Mounting Types | |
|---|---|---|---|---|---|
G41B | 5kV | 30 | — | Datasheet (PDF) — G41B | |
G47B | 8kV | 12 | — | Datasheet (PDF) — G47B | |
G43B | 10kV | 25 | — | Datasheet (PDF) — G43B | |
G81B | 10kV | 5/10 | — | Datasheet (PDF) — G81B | |
G30 | 25kV | 100 | — | Datasheet (PDF) — G30 | |
G32 | 25kV | 45 | — | Datasheet (PDF) — G32 | |
G38 | 25kV | 15 | — | Datasheet (PDF) — G38 | |
G62B | 25kV | 18 | — | Datasheet (PDF) — G62B | |
G61B | 35kV | 10 | — | Datasheet (PDF) — G61B | |
G64B | 50kV | 10 | — | Datasheet (PDF) — G64B | |
G71B | 70kV | 10 | — | Datasheet (PDF) — G71B |
MODEL CONFIGURATOR · SPST-NCREF · IMB · CFG · 126 VARIANTS
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TECHNICAL DIFFERENTIATORS
Why SPST-NC Series?
Fail-Safe Closed State
Closed on coil power loss
Natural fit for default-on power paths and continuously active auxiliary lines.
Break on command
Opens only when the supervisory system commands — ideal for bypass / isolation in protection coordination.
Redundant Protection Topologies
Form A + Form B cross-positioning
Classic HV safety topology providing redundancy against different failure modes.
HV Hermetic Contact Chamber
Vacuum / gas-filled sealed design
Arc is rapidly extinguished on opening; leakage in the closed state is minimal.
Wide environmental tolerance
Independent of humidity, pressure and dust; field reliability is high.
Form B + Form Y Coverage
Standard Form B — common HV NC
G41B, G47B, G43B, G61B, G64B, G71B, G81B and G62B span 5 kV — 70 kV.
Form Y — high-current NC
G38 (15 A), G32 (45 A) and G30 (100 A) deliver high breaking capacity at the 25 kV class.
DATASHEET · GUIDE · APPLICATION NOTE
SPST-NC Series — Technical Resources
Datasheets
- GIGAVAC HV Relay — SPST-NC Form B Datasheet Set (G41B, G47B, G43B, G62B, G61B, G64B, G71B, G81B)SOON
- Form Y High-Current NC — G30, G32, G38SOON
Selection Guides
- GIGAVAC HV Relay Selection Guide — Form A / Form B / Form Y / Form CSOON
- NC Selection Flow — Hold-open Duration, Coil Thermal Limit, CertificationSOON
Application Notes
- NC Relay Design for Default-On Safety Bypass LinesSOON
- Form A + Form B Cross-Protection TopologySOON
FREQUENTLY ASKED QUESTIONS
About the SPST-NC series
06/06
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