Honeywell – S637A1004/U Sail Switches

MPN: S637A1004/U · Brand: Honeywell

Price on request

Discontinued by Honeywell — we can still source the original S637A1004/U (new, used or refurbished, subject to availability). Request a quote below.

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12-month warranty (new) · 3-month (used/refurbished)

30-day returns, no restocking fee on unused parts

Ships via

Quick facts

Availability	Confirmed on request
Category	Honeywell Building Sensors & Detectors
Lifecycle	Discontinued
Warranty	12-month (new) · 3-month (used/refurbished)

Shipping & availability

Can I still buy the S637A1004/U now that it is discontinued?

Yes. Honeywell has discontinued the S637A1004/U, but sourcing discontinued parts is what PartnerPLC specialises in — new old stock, used and refurbished units. Request a quote and we'll confirm availability, condition and lead time.

When can S637A1004/U be shipped?

S637A1004/U is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up S637A1004/U in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for S637A1004/U and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for S637A1004/U, subject to availability and destination.

S637 Sail Switches respond to the air velocity in heating or warm air ducts, such as used in farm crop dryers. The switch completes a 24V or line voltage burner control circuit only when the blower or fan has produced a preset air velocity.

Features & Benefits:

Micro switch SPST snap switch is operated by metal sail inserted in an air stream

Has a set of normally closed contacts which can be used to energize a signal or warning circuit when the velocity drops off

Sail can trimmed to one-half the original size to double the velocity required to close the snap switch contacts

Switch differential can be manually adjusted by turning a knurled knob on the snap switch

Honeywell S637A1004/U — S637 Sail Switches respond to the air velocity in heating or warm air ducts, such as used in farm crop dryers. The switch completes a 24V or line voltage burner control circuit only when the blower or fan has produced a preset air velocity. Discontinued by Honeywell — no longer in the current range. PartnerPLC sources new, surplus and discontinued Honeywell parts — request a quote for price, condition and lead time.