Break Glass Stations

Pilla break glass emergency stations are UL Listed control stations that require the physical breaking of a glass lens or panel to actuate — providing an irreversible, auditable activation record at the point of emergency. Common applications include emergency electrical disconnect, boiler shut-down, chiller stop, generator stop, HVAC shut-down, fuel shut-off, ventilation control, and refrigerant purge across commercial and industrial facilities.

ZOT Supply stocks the full Pilla ST120 break glass line as an authorized distributor — surface-mount and flush-mount configurations across NEMA 1, 3R, 4&12, 4X nonmetallic, and 304 stainless steel enclosures. Most models are available with no push button (auto-release when glass broken), a momentary button behind glass, or a maintained button behind glass. Contact blocks are ordered separately and most stations accept 1–6 stackable contact blocks.

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ST120SN Series

Surface-Mount Break Glass — Multiple NEMA Ratings

›NEMA 1 metallic (SN1) — dry indoor locations

›NEMA 3R (SN3R) — outdoor rain exposure

›NEMA 4&12 (SN4) — indoor/outdoor, dust & splash

›NEMA 4X all-nonmetallic (SN4XNM) — corrosion resistant

›NEMA 4&12 304 stainless steel (SN4XS304)

›Maximum duty model available (SN4MDYSL)

›Fits 1–6 contact blocks • UL Listed

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ST120FN Series

Flush-Mount Break Glass — NEMA 1 & NEMA 4&12

›Flush-mount NEMA 1 (FN1) — standard backbox included

›Flush-mount NEMA 4&12 (FN4) — wet location rated

›FWB series — flush-mount NEMA 1 without backbox

›No button, momentary (BP1), or maintained (BP2) behind glass

›Wide range of application-specific legends available

›Fits 1–6 contact blocks • UL Listed

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WPSBR Series

Wall Plate Break Glass — Single-Gang Stainless Steel

›Flush single-gang stainless steel plate with hammer & chain

›NEMA 1 (indoor) rated

›Emergency Power Off, Emergency Stop, Shut-Off & custom legends

›Specialty N.O./N.C. contact block (PILKA1BR)

›Replacement lenses (PILKBR) available separately

›Fits standard single-gang electrical box

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Operator Options Available Behind Glass

No Button — Auto-Release

Breaking the glass panel directly releases the contact mechanism. No secondary button required. The most common configuration for emergency electrical disconnect.

BP1 — Momentary Button

A momentary round push button sits behind the glass. Glass must be broken to access the button. Self-resetting — delivers a pulse only.

BP2 — Maintained Button

A maintained push-on/push-off button sits behind the glass. Latches in the actuated position after being pressed. Requires a second press to reset.

Available legends include: Emergency Electrical Disconnect, Emergency Boiler Shut-Down, Emergency Chiller Stop, Emergency Fuel Shut-Off, Emergency Gas Shut-Off, Emergency Generator Stop, Emergency HVAC Shut-Down, Emergency Power Off, Emergency Refrigeration Stop, Emergency Shut-Down, Emergency Shut-Off, Emergency Stop, Emergency Ventilation On/Start/Stop/Shut-Down, Exhaust Fan, Refrigerant Purge, and custom labels — most available across all enclosure types and operator configurations.