
Square D General Duty safety switches (30 & 60A, NEMA 3R)
Square D / Schneider Electric
CPSC recall 18-140 · April 2018
- How to identify it
- A dark gray metal disconnect box with a black handle on the side, about 10" × 7" × 4", marked "Square D" with a 30A or 60A rating and 120/240-volt or 240-volt on the front label. Recalled catalog numbers are on a separate label on the side and start with D or DU (for example D221NRB, DU321RB). Date codes 1401–1803 are printed inside the cover — which you can't reach on an energized, installed switch, so the field test below matters more than the code.
- The defect
- The switch contacts can stay closed with the handle in the "OFF" position, so the disconnect doesn't actually disconnect anything.
- Safety risk
- Anyone who throws the handle, sees "OFF," and then works on the equipment downstream is working on live conductors — a shock and electrocution hazard. About 1,079,000 switches were recalled.
- Why it can shut a business down
- These are the outdoor disconnects on HVAC units, pumps, and shop equipment. A disconnect that doesn't isolate breaks the lockout/tagout step your maintenance crew and every service contractor depends on, and an inspector who finds a recalled switch will want it replaced before sign-off.
How to check it: with the load running, move the handle to “OFF.” If the equipment keeps running — or a tester still reads voltage on the load side — the switch is failing exactly the way the recall describes. Schneider Electric offered a free replacement switch plus free installation support; its Square D safety notice and the number CPSC published (877-672-1953) are the route to that.
Sold through electrical distributors, Home Depot, Lowe’s, and Amazon between January 2014 and January 2018 for $40 to $500, so these turn up on houses, shops, and outbuildings alike. If yours is one of them, don’t rely on it to make anything safe to work on — call us and we’ll verify it and swap it out.





