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WQE latching relays are primarily designed for smart meters and power control applications, handling high load currents, with high short-circuit resistance and a four-air-gap magnetic circuit structure. This clear positioning reflects a product philosophy: every reference is optimized for a specific use case.
The WL09F — The 120A metering workhorse
The WL09F-F-112DB is a single-phase magnetic latching relay with a sealed contact, compact dimensions of 76 × 43 × 25 mm, designed for household appliances, automation systems and electronic equipment. Capable of switching up to 120A at 250VAC, it is the go-to reference for prepaid meters and EV charging stations.
The WL09VA is a quick-connect terminal variant sharing the same 120A load rating, with a low-power coil — ideal for embedded or battery-powered applications.
The WL09EC — Dual coil for industrial watt-hour meters
The WL09EC is a high-power dual-coil magnetic latching relay, designed for watt-hour meters and energy meters, with a capacity of 100A to 120A at 250VAC and dimensions of 52 × 43 × 21 mm. Its dual-coil configuration ensures a clean switching between “set” and “reset” modes, with no state ambiguity — an essential criterion for billing and remote meter reading.
The WL73D — Versatility in a miniature form factor
The WL73D is a 10A signal latching relay, single-pole, with single or dual coil, and a coil power of 0.4W to 0.8W. Its low power consumption and compact footprint make it a preferred choice for signal control applications, smart home, and audio equipment.
The technical advantages that make the difference
- Zero power consumption in hold state. Like all latching relays, WQE models maintain their position without continuous coil energization. In a smart meter powered by the line voltage or a backup battery, this translates into direct, measurable energy savings.
- Short-circuit and impulse current resistance. The four-air-gap magnetic structure of WQE latching relays provides high short-circuit resistance and explosion-proof protection (impulse current), which is essential in residential and industrial environments.
- Sealed relays for long-term reliability. WL09F references feature sealed relay protection, shielding contacts from contaminants, moisture and dust throughout their entire service life.
- Customization and commercial flexibility. WQE accepts OEM and ODM orders, provides samples within 3 to 7 days, and delivers mass production in 2 to 4 weeks depending on quantities. There is no strict MOQ: customers are encouraged to order samples to validate quality before committing.
Who are these relays designed for?
WQE latching relays are primarily aimed at manufacturers of single-phase and three-phase smart meters, energy management system integrators, EV charging station designers, and OEMs in residential and industrial automation.
With a range spanning from the miniature signal relay (WL73D, 10A) to the high-power relay (WL09F, 120A), WQE covers the full spectrum of bistable switching needs — backed by international certifications, large-scale automated production, and responsive technical support.
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