Zinsco QCAL-15 U Molded Case Circuit Breaker

The Zinsco QCAL-15 U Molded Case Circuit Breaker is a 15 Amp, 2-pole device designed for use in Zinsco / GTE Sylvania load centers. It operates on 240V systems and uses a thermal-magnetic trip mechanism to protect circuits from overloads and short circuits. This breaker belongs to the QCAL (QC/QCAL series) and features plug-in (snap-in) mounting for compatible panels, with an interrupt rating of ~10 kAIC at 240V. It is an obsolete, discontinued product now mainly available as surplus or refurbished units. Commonly used in residential and light commercial 240V branch circuits for loads such as small HVAC units, pumps, water heaters, and other dedicated appliance loads requiring 15A protection, it is intended for legacy Zinsco panels and is typically used for maintenance or replacement rather than new installations. For compatibility in similar panels, common replacements include the Connecticut Electric UBIZ215 2-Pole 15A Zinsco replacement, as well as Siemens Q215 2-Pole 15A Circuit Breaker and Square D QO215 2-Pole 15A Circuit Breaker.