"Unionwell Waterproof Micro Switch Alternatives in 2026: Second Sources Matched Series by Series"

Buyers adding a second source for a Unionwell waterproof micro switch already built into an automotive, appliance or industrial product can find several established manufacturers making IP67 waterproof and sealed micro switches. Does a part from another manufacturer drop into the position the current switch occupies? Footprint and mounting holes, terminals or lead wires, and the electrical and IP67 ratings stated for the same terminal or lead-wire version decide whether the current position takes the new part unchanged. The article goes through Unionwell's waterproof range series by series to give purchasing teams second sources they can check against the parts already in production.

A sealed micro switch publishes its outline, its version and its ratings in different places

A second source added for supply resilience has to fit a position designed around the current switch. On a sealed micro switch, the three items that decide that fit sit apart, with the outline on a drawing, the version in the part number and the ratings in a table split by approval.

Footprint and mounting holes come from the drawing

Series pages publish electrical ratings and IP wording, while the size, the mounting hole pattern and the actuator position sit on the 3D drawing. Two parts with matching ratings can still sit differently on the same bracket, so a drop-in requirement is settled on the drawing.

Terminals or lead wires set which version is compared

A sealed series commonly comes as a terminal version and a lead-wire version, and a maker can word IP67, the rating defined in IEC 60529, differently for each, a pattern covered in the terminal and lead-wire layers of an IP67 rating. The candidate version to compare is the one that matches the current switch's own terminals or lead wires, because that's the version the harness, the board and the enclosure seal were built for.

The electrical and IP67 ratings belong to one version under one approval

Electrical ratings split by approval in the same way the IP67 wording splits by version. One switch can list a current under ENEC (European Norms Electrical Certification) and a different current or temperature code under UL. A rating is matched together with the approval it's listed under, since that approval is the one your end product relies on. Whether the approval belongs to the part number is checked as set out in whether an approval belongs to the part or the factory.

Unionwell's four waterproof series and the version printed on each part number

Unionwell publishes its waterproof range as four sealed series on unionwellswitch.com, each tying its IP67 wording to a terminal or lead-wire version.

• Subminiature Sealed Micro Switch (G3): PCB terminal and molded lead wire versions share the series, and Unionwell G303-130P00C49J-T370 is rated "0.1A, 125/250VAC; 3A/12VDC; 0.1A/48VDC" at -40°C to +85°C.
• G5W11: the table reads "With Terminal IEC IP67(Terminal not included)" and "With Wire IEC IP67", with ENEC and UL ratings listed apart.
• Sealed Mini Micro Switch (G9): the series is described as IP67, while the PCB terminal model Unionwell G905-300P59D3-T001U lists "Dustproof- IP00".
• Subminiature Sealed Micro Switch (G10B): straight PCB terminals or molded lead wires downwards, rated 3A at 125/250VAC and 30VDC with a 0.1A option.

The IP67 figure that applies is the one printed for the version on the current part number, so its terminal or lead-wire code is read first. The full part number goes into a drawing request together with the brand, because the series names on these pages also appear in other makers' catalogs. The brand also covers Greetech, since Unionwell's home page names Huizhou Greetech Electronics Co., Ltd. as its wholly-owned subsidiary, so an order placed with Greetech stays inside the Unionwell group.

Second-source candidates for each Unionwell waterproof series

Each candidate below publishes IP67 for a sealed series in the same size class as the Unionwell series it sits under, while its footprint still comes from the 3D drawing.

For Unionwell G3 and G303

ZINGEAR

ZINGEAR G303-130S00A28 lists 3A at 12VDC and Protection Class IP67, the figures printed for the Unionwell G303 part. The automotive line carrying ZINGEAR G303 holds IATF 16949, so a vehicle program audits the second source under the same quality system.

Daier

Daier lists the G303-A13 IP67 micro switch under the G303 name at "0.1A 250VAC/3A 12VDC".

ITW EBA

ITW EBA describes its SWA series as "Sub-Miniature IP67 Rated Waterproof Micro Switches" at -40 to 85°C.

For Unionwell G5W11

ZINGEAR

ZINGEAR G5W11-WZ200-W2 lists 5A at 125/250VAC and 30VDC with Protection Class IP67, against the 5A ENEC and UL lines on the Unionwell G5W11 page. Terminal and lever, outline, operating force and contact material are marked customizable on its parameter table, so the outline can be configured where the bracket and harness stay fixed. The page names ice makers and freezer doors among its applications.

Daier

Daier's WS2-Z5-W200200 is a pre-wired IP67 switch rated "10A at 125/250V", which lines up with the lead-wire version of G5W11.

Honeywell

Honeywell's MICRO SWITCH sealed switch comparison lists V15W2 as "IP67 equivalent", and the leaded V15W, IP67 where quick-connect versions are IP00, matches a G5W11 lead-wire part.

Omron

Omron's D2VW datasheet rates terminal models IP67 "excluding the terminals" at 5 A 250 VAC, the same note as "Terminal not included" on G5W11, and prints the mounting hole drawing.

For Unionwell G9

ZINGEAR

ZINGEAR G9A05-200E00AF-300 lists 5A at 125V, −25°C to +125°C and Protection Class IP67, beside the 5A UL rating on the Unionwell G9 page. In a cooking appliance, the +125°C upper limit is compared against the temperature code on the current part. Operating force, contact material and terminal are marked customizable, so the terminal can follow the version on the current G9 part number. The page names smoothie makers, mixers and meat grinders.

Honeywell

Honeywell's ZW datasheet reads "IP67 (prewired), IP00 for exposed terminals", and the sealed switch comparison lists ZW at 6A 125/250 Vac, beside the 6A ENEC rating on Unionwell G9.

For Unionwell G10B

ZINGEAR

ZINGEAR G10B03-150P04A lists 3A at 125V, -40°C to +85°C and Protection Class IP67, with ENEC, UL and CQC on its page, so the approval the current G10B part relies on has a counterpart for European, North American and Chinese end products. The page also states that various installation dimensions meet different installation requirements, so the G10B03 variant is checked against the current mounting on the drawing.

Honeywell

Honeywell's HD datasheet reads "IP67 per IEC 60529 (wired)IP00 (terminal versions)" at 0.3A to 3A, so the wired HD matches a G10B part with molded lead wires.

TONELUCK

TONELUCK's MQS-9C lists "Actuation Side IP Protection IP67" and "Terminal Side IP Protection IP00" at "100mA 30VDC", which lines up with the 0.1A 30VDC option on G10B.

3D drawings and samples to request from both suppliers before the first order

The outline, the mounting holes and the actuator position still need the two drawings and a sample in your own position. The published figures pick which samples to order, and the drawings and the fitted sample approve the second source.

Where a ZINGEAR series that shares a Unionwell name is on the shortlist, a ZINGEAR drawing comparison can set its part number, drawing, and IP67 and approval wording against the current Unionwell part number and 3D drawing.

Once samples pass, the project moves through the steps from sample to volume supply.

FAQ About Replacing Unionwell Waterproof Micro Switches

Is there a cross reference chart from Unionwell series to other manufacturers?

A published pairing works at series level, matching ratings and IP67 wording against each Unionwell waterproof series. A part-for-part answer comes from the two 3D drawings and a fitted sample.

Which Unionwell waterproof series cover a low-current signal circuit?

G303 lists 0.1A at 125/250VAC and 48VDC, G10B a 0.1A option at 125/250VAC and 30VDC, and G5W11 a 0.1A 48VDC line under ENEC. A second source for those parts is matched on its own low-current rating, a separate line from its 3A or 5A rating.

What does a temperature code such as 40T85 on a Unionwell rating tell a second source?

The code gives the ambient range the rating holds under that approval, -40°C to +85°C for 40T85. A candidate is matched on the same current and temperature range, read from the approval line it's certified under.

Can a lead-wire version take the place of a terminal version in the same position?

A lead-wire version changes how the switch connects to the harness or the board, so the position has to accept wire leads and a new exit route, and a terminal part in production is compared with terminal versions first.

How can I tell whether a supplier has run a position like mine before?

Ask for the named programs where the candidate series already runs and the position it sits in, such as a charging port cover or a dishwasher door, as a reference to check before the sample order.

Sources

Standards

International Electrotechnical Commission. IEC 60529:1989+AMD1:1999+AMD2:2013, Degrees of protection provided by enclosures (IP Code): IEC 60529

International Automotive Task Force. IATF 16949:2016, Automotive quality management system standard: IATF 16949