Zinsco | R3840 | Circuit Breaker | 2-Pole | 240V

Meet the Zinsco R3840, a purpose-built 2-pole 240V circuit breaker designed to deliver dependable protection for your 240V circuits. This unit is the right choice for maintenance, retrofit, and replacement projects where exact specifications matter, and where the part number R3840 serves as the strongest compatibility reference.

• Exact spec match: The R3840 part number is your best reference for compatibility with Zinsco panels and associated bus and trip characteristics.
• Two hot legs, one safety path: The 2-pole design interrupts both energized conductors together, ensuring complete disconnection of a 240V circuit for safer operation of appliances like dryers, ranges, water heaters, or EV charging circuits.
• 240V protection: Specifically rated for 240V circuits, providing appropriate interrupting capability and coordination within compatible panels.
• Maintenance-friendly retrofit: Ideal when upgrading an older panel or replacing a failing breaker, provided the panel accepts Zinsco R-series 2-pole breakers.
• Quality fit: Before ordering, verify fit and ratings on the panel label; the R3840 part number is the most reliable guide to compatibility.

Ideal use cases

• Residential 240V circuits such as clothes dryers, electric ranges, water heaters, or dedicated EV charging circuits in homes using Zinsco panels.
• Retrofits in aging electrical installations where a like-for-like replacement minimizes changes to bus bars and mounting hardware.
• Maintenance replacements in service panels requiring a precise 2-pole 240V protector that aligns with existing protective schemes.

What to know before you buy

• Fit and ratings: Always confirm the panel's listed compatible breaker family and that the R3840’s voltage aligns with your circuit’s requirements.
• Compatibility reference: The R3840 part number remains the most dependable reference for matching breakers to Zinsco panels.
• Safety: Power should be shut off at the main breaker, and local electrical codes followed; if you’re unsure, consult a licensed electrician before performing any replacement.

Choosing the right circuit breaker matters for reliable protection and peace of mind. The Zinsco R3840 2-Pole 240V breaker is designed to align with your panel’s protection strategy, delivering dependable performance when it matters most.