SQUARE D
SQUARE D QO135 Miniature Circuit Breaker 35A 1 Pole 120/240V AC
Single-pole miniature circuit breaker rated 35 A at 120/240 V AC with a 10 kA interrupting rating for QO load centres
- 35 A single-pole protection for 120/240 V AC circuits
- 10 kA interrupting rating handles high fault currents safely
- Plug-in mounting fits QO load centres and NQ panelboards directly
- Lug terminals accept standard wire without special tools
- Compact 3.1 × 0.8 × 2.9 in frame saves panel space
QO Series 35 A Single-Pole Breaker
This SQUARE D QO135 miniature circuit breaker provides 35 A over-current protection for single-phase 120/240 V AC branch circuits. It is designed for electricians and facility managers who need a reliable, plug-in device for QO load centres or NQ panelboards. The standard paddle actuator gives clear on/off/trip indication during routine maintenance or fault finding. Rated for 48 V DC as well, it suits mixed-voltage control panels.
Plug-In Mounting With Lug Terminals
The breaker snaps into compatible QO series buswork without tools, reducing installation time on new builds or retrofit jobs. A 100 A frame size and lug terminals accept standard copper conductors, while the 10 kA interrupting rating at 120/240 V AC meets typical residential and light-commercial fault-current requirements. Compact dimensions of 3.1 in length, 0.8 in width and 2.9 in depth allow dense panel layouts. Minimum operating temperature is 77 Degrees F.
Replaces Worn Or Undersized QO Breakers
Use this unit to swap out a tripping or damaged 1-pole QO breaker of the same amperage, or to upgrade a circuit from a lower rating when the conductor ampacity permits. The jump is worth it when a panel audit shows nuisance trips on motor-start loads or when adding a dedicated 35 A branch for equipment such as a generator inlet or EV charger. It does not fit non-QO panelboards, so buyers with Homeline, BR or other bus types must select a different series.
Highlights
- 35 A single-pole protection for 120/240 V AC circuits
- 10 kA interrupting rating handles high fault currents safely
- Plug-in mounting fits QO load centres and NQ panelboards directly
- Lug terminals accept standard wire without special tools
- Compact 3.1 × 0.8 × 2.9 in frame saves panel space
Specifications
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Questions about this item
What is the interrupting rating at 120/240V AC?
The breaker provides a 10 kA interrupting rating at 120/240V AC, limiting the fault current it can safely clear on a single-phase supply.
What panel space and mounting style does the QO135 require?
It occupies one standard QO pole space and uses a plug-in mounting style compatible with QO load centres and NQ panelboards.
How is the QO135 installed and what step is often missed?
Snap the breaker onto the panel bus until it seats firmly, then tighten the lug terminal on the load conductor; the step often missed is verifying the lug torque.
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