ZINSCO QCAL-50N N 50A 240V 2-pole Molded Case Circuit Breaker QCAL50N

Description:

The Zinsco QCAL-40N N is a 40 Amp, 2-pole molded case circuit breaker designed for use in Zinsco / GTE Sylvania load centers. It operates on 240V systems and uses a thermal-magnetic trip mechanism to provide protection against overloads and short circuits. This breaker is part of the QCAL (QC/QCAL series) and features a plug-in (snap-in) mounting style for installation in compatible panels. Similar QCAL series breakers are rated by amperage, voltage, and pole configuration, confirming the 40A, 240V, 2-pole format.

Applications:

The Zinsco QCAL-40N breaker is commonly used in residential and light commercial electrical systems for 240V branch circuits requiring 40A protection, such as air conditioning units, electric heaters, compressors, and medium-load equipment. It is specifically intended for legacy Zinsco panels and is typically used today for maintenance or replacement of existing installations rather than new builds.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania
• Model / Part Number: QCAL-40N N
• Product Type: Molded Case Circuit Breaker
• Poles: 2-Pole
• Current Rating: 40 Amps
• Voltage Rating: 240 VAC
• Mounting: Plug-in / Snap-in (QC/QCAL series)
• Trip Type: Thermal-magnetic
• Interrupt Rating: ~10 kAIC @ 240V (typical class)
• Function: Overcurrent and short circuit protection
• Status: Obsolete / discontinued (surplus or aftermarket availability)

Common Replacements:

• Connecticut Electric UBIZ240 2-Pole 40A Zinsco Replacement Breaker
• Siemens Q240 2-Pole 40A Circuit Breaker
• Square D HOM240 / QO240 2-Pole 40A Circuit Breaker