What is a latching (magnetic-hold) relay?

A latching relay is an HV relay that holds its contact position with a permanent magnet without continuous coil energy. Switching is done with a single pulse; after the pulse the coil is de-energised and the contact remains magnetically held in its new position. The position is preserved until a pulse in the opposite direction is applied. This distinguishes it from classic (monostable) relays that must stay continuously energised.

When should I choose a latching relay?

Low-power-budget, battery-backed or portable HV systems are the natural fit: portable test equipment, battery-backed safety disconnects, remote / off-grid HV switches, and standby applications requiring long-term stable position. Without continuous coil consumption, heat dissipation drops and battery life is extended.

What are the pulse width and driver requirements?

The minimum pulse width is defined per model in the datasheet (typically tens of ms). The driver only needs to supply sufficient current for the pulse duration; the coil then becomes idle. Some models use two separate coils (set / reset), others use a single bidirectional coil. Wrong-polarity pulses or too-short pulses can corrupt the position change; the datasheet timing diagram is mandatory for driver design.

What happens to the contact on coil power loss?

Thanks to magnetic hold the current position is retained — open stays open, closed stays closed. This is an advantage or drawback depending on your safety philosophy: ideal where 'preserve current state' is desired (long-term stability, battery-backed systems). Where classic fail-safe 'must open on coil loss' is required, monostable Form A should be chosen instead.

Which contact forms are available as latching?

Three forms are listed together in this family. SPST-NO Form A: G61LA (35 kV / 10 A), G71LA (70 kV / 10 A). SPDT Form C: G15L, G2L, G8L, G62LC, G60L, G61LC, G64LC, G71LC. DPDT Form C: G12L (8 kV / 10 A), G13L (15 kV / 10 A). Each latching model usually shares the chassis with its non-latching equivalent; only the coil/magnet assembly differs.

Does choosing latching vs non-latching create a cost difference?

Per-relay cost is somewhat higher for latching (due to the magnet group), but system cost is often lower: coil-driver power budget shrinks, thermal management simplifies, battery backup capacity is reduced. We evaluate the choice at RFQ stage together with the application's power budget and thermal targets.

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Latching High Voltage Relays — Zero Coil Holding Current

12 models · 8-70 kVdc switching · 10-50 A continuous · Mechanical latch · Zero coil holding current · SPST-NO / SPDT / DPDT cross-forms

The GIGAVAC Latching family mechanically latches the contact in either position and requires no continuous coil current. A single coil pulse toggles position permanently; the contact stays put even when control power is lost — ideal for satellites, portable test gear, battery-powered systems and continuously-energised protection circuits.

Frame-dependent contact configurations span SPST-NO (Form A), SPDT (Form C) and DPDT (2 Form C); each model card explicitly states its contact form and cross-links to the equivalent non-latching variant. Switching range covers 8 kVdc up to 70 kVdc with 10 A to 50 A continuous current.

Zero holding current makes thermal load and energy consumption negligible in battery / ESS load disconnect, satellite isolation and remote-controlled HV transfer applications. The configurator generates the original Sensata part-no automatically based on contact / coil / mount selections.

Satellite & Space SystemsBattery / ESS Load DisconnectPortable HV Test EquipmentRemote HV TransferContinuously-Energised ProtectionATE & Automatic TestScientific InstrumentationLow-Power / Battery-Powered Systems

SERIES CERTIFICATIONS09APPROVALS

UL1604
IP67
IP69K
SAE J1171
ISO8846
RoHS
cRUus
CE
EPIC®

Certifications vary by model — see the corresponding model datasheet for details.

REFERENCE SPECIMENLATCHING · 01

HERMETIC · LATCHINGLATCHING HV RELAYSENSATA

Latching Relays series family image; this model's body and terminations may differ.

Models

Products

129

01Max. Switching Voltage: 70 kVdc
02Max. Continuous Current: 50 A
03Holding Current: 0 A · Mechanical latch
04Model Count: 12 models

Latching Models

12 models · Holds state without continuous coil power

12 MODELS6 PRODUCTS

CONFIGURATOR	MODEL	Contact Form	Contact Voltage (kV)	Continuous Current (A)	Mounting Types	PDF
	G12L	Form C, DPDT	8kV	10	—	Datasheet (PDF) — G12L
CONFIGURATOR · G12LMODEL-SPECIFIC
	G13L	Form C, DPDT	15kV	10	—	Datasheet (PDF) — G13L
CONFIGURATOR · G13LMODEL-SPECIFIC
	G15L	Form C	15kV	12	—	Datasheet (PDF) — G15L
CONFIGURATOR · G15LMODEL-SPECIFIC
	G2L	Form C	15kV	50	—	Datasheet (PDF) — G2L
CONFIGURATOR · G2LMODEL-SPECIFIC
	G8L	Form C	15kV	30	—	Datasheet (PDF) — G8L
CONFIGURATOR · G8LMODEL-SPECIFIC
	G62LC	Form C	25kV	18	—	Datasheet (PDF) — G62LC
CONFIGURATOR · G62LCMODEL-SPECIFIC
	G60L	Form C	35kV	12	—	Datasheet (PDF) — G60L
CONFIGURATOR · G60LMODEL-SPECIFIC
	G61LA	Form A	35kV	10	—	Datasheet (PDF) — G61LA
CONFIGURATOR · G61LAMODEL-SPECIFIC
	G61LC	Form C	35kV	10	—	Datasheet (PDF) — G61LC
CONFIGURATOR · G61LCMODEL-SPECIFIC
	G64LC	Form C	50kV	10	—	Datasheet (PDF) — G64LC
CONFIGURATOR · G64LCMODEL-SPECIFIC
	G71LA	Form A	70kV	10	—	Datasheet (PDF) — G71LA
CONFIGURATOR · G71LAMODEL-SPECIFIC
	G71LC	Form C	70kV	10	—	Datasheet (PDF) — G71LC
CONFIGURATOR · G71LCMODEL-SPECIFIC

MODEL CONFIGURATOR · LATCHINGREF · IMB · CFG · 129 VARIANTS

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STEP-BY-STEP CONFIGURATION

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TECHNICAL DIFFERENTIATORS

Why Latching Series?

05 · CATEGORIES

Position-Retained Behaviour

Position retained on coil loss
Natural fit for the 'preserve current state' safety philosophy — storage, standby, long-term isolation.
Power-cycle resilience
Position does not change during system reset / maintenance — no reconfiguration needed.

Three Contact Forms Under One Family

SPST-NO · SPDT · DPDT latching
Form A (G61LA, G71LA), Form C SPDT (G15L, G2L, G8L, G62LC, G60L, G61LC, G64LC, G71LC) and Form C DPDT (G12L, G13L) under a single header.
Parallel cataloguing with non-latching equivalents
The non-latching equivalent on the same chassis is listed on the corresponding form page — easy to compare and switch.

Wide HV Range

8 kV — 70 kV voltage range
Industrial HV (G12L, G13L) and ultra-high voltage (G71LA, G71LC) under the same latching philosophy.
10 — 50 A continuous current
Single family from signal/measurement level to mid-power switching.

Driver Design and Thermal

Low-power pulse driver is enough
No continuously-current coil driver required; simple pulse circuitry and low thermal loss.
Datasheet pulse timing must be respected
Wrong polarity or insufficient pulse width corrupts position change — the timing diagram is critical.

Zero-Hold-Current Magnetic Latch

Pulse-driven open / close, 0 W consumption afterwards
The coil draws energy only at the moment of switching — no energy in long-term stable position.
Ideal for battery-backed systems
Dramatically extends battery life in low-power-budget portable / off-grid HV equipment.

DATASHEET · GUIDE · APPLICATION NOTE

Latching Series — Technical Resources

08 · FILES

Datasheets

GIGAVAC Latching Form A — G61LA, G71LASOON
GIGAVAC Latching Form C SPDT — G15L, G2L, G8L, G62LC, G60L, G61LC, G64LC, G71LCSOON
GIGAVAC Latching Form C DPDT — G12L, G13LSOON

Selection Guides

Latching vs Monostable — Decision FlowSOON
GIGAVAC Latching Family Selection Guide — Form A / Form C SPDT / Form C DPDTSOON

Application Notes

Pulse Driver Circuit Design and TimingSOON
Latching Positioning in Battery-Backed HV DisconnectsSOON
Power Budget in Off-grid and Portable HV Test EquipmentSOON

FREQUENTLY ASKED QUESTIONS

About the Latching series

06/06

RELATED INSIGHTS · LATCHINGREF · IMB · PUB · 01 ENTRIES

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RELATED INSIGHTS

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01 ENTRIES

01
GIGAVAC Akıllı Kontaktör ve HV Röle Serileri
GIGAVAC ürün ailelerinin genel tanıtımı ve röle taksonomisi.
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// end of index · 01 / 01

Latching High Voltage Relays — Zero Coil Holding Current

Haven't picked a model from the table? Configure from scratch

Why Latching Series?

Position-Retained Behaviour

Three Contact Forms Under One Family

Wide HV Range

Driver Design and Thermal

Zero-Hold-Current Magnetic Latch

Latching Series — Technical Resources

Datasheets

Selection Guides

Application Notes

About the Latching series

01What is a latching (magnetic-hold) relay?

02When should I choose a latching relay?

03What are the pulse width and driver requirements?

04What happens to the contact on coil power loss?

05Which contact forms are available as latching?

06Does choosing latching vs non-latching create a cost difference?

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GIGAVAC Akıllı Kontaktör ve HV Röle Serileri