SRL135 Supco Manual Reset Rollout Limit

The Supco SRL135 is a 135°F manual‑reset rollout limit switch designed to protect furnaces and heating equipment from unsafe flame rollout or overheating conditions. This SPST, open‑on‑rise safety switch interrupts burner operation when temperatures reach 135°F, requiring a manual reset before the system can restart — ensuring a technician inspects the equipment for proper combustion and airflow.

Built with a durable bimetal disc and compact 36T‑style housing, the SRL135 is a dependable replacement for OEM rollout switches used in residential and commercial HVAC systems.

🔧 Cross‑Reference 

Direct / Same Temperature Class

• SRL135 — Supco 135°F Manual Reset Rollout Switch

Technician Notes

• Manual‑reset rollout switches must never be bypassed — they indicate unsafe combustion or blocked heat exchanger conditions.

• Replace only with matching temperature rating (135°F for SRL135).

• Common causes of tripping: cracked heat exchanger, blocked flue, failed blower, dirty filter, misaligned burners.

• SPST, open‑on‑rise — verify proper mounting orientation for accurate sensing.