ZINSCO QCAL-90 U 90A 240V 2-pole Molded Case Circuit Breaker QCAL90

Description:

The Zinsco QCAL-90 U is a 90 Amp, 2-pole molded case circuit breaker designed for use in Zinsco / GTE Sylvania load centers. It operates on 240V systems and features a thermal-magnetic trip mechanism to protect circuits from overloads and short circuits. It belongs to the QCAL (QC/QCAL series) and uses a plug-in (snap-in) mounting style for installation in compatible panels. Standard specifications include a 90A rating, 2 poles, and 240V operation with a typical interrupt rating of approximately 10 kAIC.

Applications:

The Zinsco QCAL-90 breaker is commonly used in residential and light commercial electrical systems for 240V circuits requiring 90A protection, such as large HVAC systems, subpanels, feeders, and heavy-duty equipment loads. It is specifically intended for legacy Zinsco panels and is primarily used today for maintenance or replacement of existing installations.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania / Thomas & Betts
• Model / Part Number: QCAL-90 U / QCAL90
• Product Type: Molded Case Circuit Breaker
• Poles: 2-Pole
• Current Rating: 90 Amps
• Voltage Rating: 240 VAC
• Mounting: Plug-in / Snap-in (QC/QCAL series)
• Trip Type: Thermal-magnetic
• Interrupt Rating: ~10 kAIC @ 240V
• Phase: Single-phase
• Function: Overcurrent and short circuit protection
• Status: Obsolete / discontinued

Common Replacements:

• Connecticut Electric UBIZ290 2-Pole 90A Zinsco Replacement Breaker
• Siemens Q290 2-Pole 90A Circuit Breaker
• Square D QO290 2-Pole 90A Circuit Breaker