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Allen-Bradley Bulletin 300 Contactors: Catalog Numbers by NEMA Size

Last updated: September 30, 2026

Bulletin 300 catalog numbers differ by only a letter or a trailing digit, and those differences change the coil or the configuration. Every Bulletin 300 number we currently list is grouped below by NEMA size, each linking to its own page.

Short answer

  • Bulletin 300 is an Allen-Bradley contactor line. The listings below are NEMA-rated contactors, grouped by the NEMA size each listing states.
  • Catalog numbers in this line often differ by one letter or a trailing digit (for example 9310, 9311 and 9400 endings). Treat them as different parts until the datasheet says otherwise.
  • Confirm the full catalog number, coil voltage and NEMA size from the existing contactor nameplate before ordering a replacement.
  • Most listings are quote-only. Email the full catalog number and quantity to orderdesk@kkmsolutions.com for pricing and availability within one business day.

What this page covers

Bulletin 300 is an Allen-Bradley line of motor-starting contactors. This page lists the Bulletin 300 catalog numbers currently published in our catalog, grouped by the NEMA size stated on each listing. It is an index to help you find the exact number, not a substitution chart.

NEMA size versus IEC rating

NEMA contactors are sized in steps (Size 0, 1, 2 and up) that each carry a defined continuous-current and horsepower rating under NEMA standards. IEC contactors are rated by AC-3 current instead. The two are not labelled the same way, so a NEMA size cannot be read off an IEC amp figure by eye. Our IEC contactor selection guide and the contactor cross-reference tool cover converting between the two.

Before you order a replacement

  • Read the full catalog number off the nameplate. Two Bulletin 300 numbers that differ by a single character are separate parts.
  • Match the coil voltage printed on the existing coil, not just the size.
  • Check the NEMA size stated on the nameplate against the listing below.
  • Note any auxiliary contacts or accessories fitted to the old unit so the quote covers them.

If the line is discontinued in your application, see our obsolete Allen-Bradley parts guide, or search the exact number in the catalog.

Bulletin 300 catalog numbers we list

Every currently published Bulletin 300 number, grouped by the NEMA size its listing states. Open one to check its details, or request a quote from its page.

NEMA Size 0

NEMA Size 1

NEMA Size 2

NEMA Size 3

NEMA Size 4

NEMA Size 5

NEMA Size 6

NEMA Size 7

Other Bulletin 300 catalog numbers

Frequently asked questions

Are Bulletin 300 catalog numbers that differ by one digit interchangeable?

Not automatically. Numbers in this line that differ by a letter or a trailing digit are separate listings, and the difference can be the coil or the configuration. Confirm against the datasheet or the existing nameplate before substituting.

How do I find the NEMA size of an existing contactor?

The NEMA size is printed on the contactor nameplate or in its datasheet. Use that, not the physical size, when matching a replacement.

Can KKM Solutions source a Bulletin 300 number that is not listed here?

Yes. Email the full catalog number and quantity to orderdesk@kkmsolutions.com. We source to exact manufacturer specification per order, so a number not being listed does not mean it is unavailable.

Need a quote on a specific part?

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