Square D MAL36500-1212 MAL365001212 - 500A 3 Pole Molded Case Circuit Breaker

The -1212 suffix signifies that this breaker includes a factory-installed 1A/1B auxiliary switch. This provides one normally open (NO) and one normally closed (NC) contact for remote status signaling or control circuit integration.

Yes, the MAL36500-1212 shares the exact same physical dimensions, mounting footprint, and electrical ratings as the standard MAL36500. The only difference is the addition of the factory-installed auxiliary switch, which can simply be left unwired if your application does not require remote signaling.

This M-frame molded case circuit breaker is designed for use in Square D switchboards and motor control centers. It utilizes a unit mount, feed-thru configuration rather than a plug-on I-Line connection.

This is a unit mount breaker, meaning it bolts directly to the mounting pan or backplate of the enclosure, switchboard, or motor control center. It uses feed-thru lug connections for both line and load sides, distinguishing it from I-Line panelboard breakers that plug directly onto a bus.

The factory-installed line and load side lugs accept three conductors per phase, ranging from 3/0 AWG to 500 kcmil. The terminals are dual-rated for both aluminum and copper wire.

This breaker features a non-interchangeable thermal-magnetic trip unit with a fixed thermal element for long-time overload protection. However, the magnetic element is adjustable for instantaneous short-circuit protection, allowing you to fine-tune the trip response.

The LI designation means the trip unit provides Long-Time (L) and Instantaneous (I) protection. The Long-Time function protects against sustained overloads, while the Instantaneous function clears high-level short circuits immediately.

Yes, in addition to its AC ratings, the MAL36500-1212 is rated for use in DC systems up to 250VDC, providing an interrupting capacity of 14kA.