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Worcester Bosch Protection Switch PKZM0-25 87485102040

Worcester Bosch

Worcester Bosch Protection Switch PKZM0-25 87485102040

Worcester Bosch protection switch PKZM0-25, a 25A safety switch for Greenstore system boilers.

At a glance

  • Also known as PROTECTION-SWITCH-PKZM0-25, 1022796
Manufacturer part no.
87485102040
Showing prices

£318.78

£265.65 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Protection switch PKZM0-25 is a 25A safety switch supplied by Worcester Bosch for use in its Greenstore system boiler range. It forms part of the appliance's electrical protection circuit, isolating the boiler supply under fault conditions. The component is listed by the manufacturer under part number 87485102040.

Signs this part needs replacing

  • The boiler fails to power up or will not run, with no supply reaching the appliance controls.
  • The switch trips repeatedly and will not hold in the run position.
  • The switch cannot be reset manually after tripping.
  • Visible scorching, discolouration or burning at the switch terminals or housing.
  • Intermittent shutdowns of the boiler traced to the protection circuit.

Before you order

  • Confirm the part number on the existing switch matches 87485102040.
  • Check the boiler model against the fitment list above before ordering.
  • Verify the 25A rating is correct for the appliance's supply arrangement.
  • Isolate the electrical supply and confirm safe isolation before removing the existing switch.

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.