Honeywell BX Series Explosion-Proof Limit Switches – BXA3K-1A BXM4N

Name: Honeywell BX Series Explosion-Proof Limit Switches – BXA3K-1A BXM4N
Brand: Honeywell

Model: BXA3K-1A BXM4N

Brand Honeywell

Series BXA3K-1A BXM4N

Model BXA3K-1A BXM4N

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Technical Dossier

Product Details And Specifications

Honeywell BX Series Explosion-Proof Limit Switches Technical Notes

The Evolution of BX Series Architecture

The BX Series was introduced by Honeywell (formerly Micro Switch division) as a direct response to NEC Article 501 and IEC 60079 requirements for intrinsically safe and explosion-proof switching in Zone 1 / Zone 2 classified areas. Early production units used silver-alloy snap-action contacts rated at 10A / 600VAC, housed in a two-piece cast aluminum enclosure with NPT conduit entries. The BXA sub-family introduced modular actuator heads (BXM4N, BXM4R, BXM4L) that could be field-swapped without disturbing conduit wiring — a critical maintainability feature for turnaround-constrained refineries.

BX Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Honeywell BX Series. Units are classified by actuator type and contact configuration.

Explosion-Proof Limit Switches — Plunger & Roller Actuator

BXA3K-1A BXM4N: Explosion-proof limit switch, 1NO+1NC SPDT, 3/4" NPT, neutral roller lever actuator, 10A/600VAC, Class I Div 1 Groups C&D
BXA3K-2A BXM4N: Explosion-proof limit switch, 2NO+2NC DPDT, 3/4" NPT, neutral roller lever, 10A/600VAC, dual-circuit interlock applications
BXA3K-1A BXM4R: Explosion-proof limit switch, 1NO+1NC SPDT, 3/4" NPT, right-hand roller lever actuator, valve position feedback
BXA3K-1A BXM4L: Explosion-proof limit switch, 1NO+1NC SPDT, 3/4" NPT, left-hand roller lever actuator, mirror-image mounting
BXA3K-2A BXM4R: Explosion-proof limit switch, 2NO+2NC DPDT, 3/4" NPT, right-hand roller lever, SIS interlock duty
BXA3K-2A BXM4L: Explosion-proof limit switch, 2NO+2NC DPDT, 3/4" NPT, left-hand roller lever, SIS interlock duty
BXA4K-1A BXM4N: Explosion-proof limit switch, 1NO+1NC SPDT, 1" NPT dual entry, neutral roller lever, heavy-duty actuator torque
BXA4K-2A BXM4N: Explosion-proof limit switch, 2NO+2NC DPDT, 1" NPT dual entry, neutral roller lever, high-cycle valve duty
BXA3K-1A BXM2N: Explosion-proof limit switch, 1NO+1NC SPDT, 3/4" NPT, short neutral plunger actuator, compact installation envelope
BXA3K-2A BXM2N: Explosion-proof limit switch, 2NO+2NC DPDT, 3/4" NPT, short neutral plunger, dual-output position sensing
BXA3K-1A BXM6N: Explosion-proof limit switch, 1NO+1NC SPDT, 3/4" NPT, adjustable roller lever, variable cam geometry applications
BXA3K-2A BXM6N: Explosion-proof limit switch, 2NO+2NC DPDT, 3/4" NPT, adjustable roller lever, multi-position detection
BXA3K-4A BXM4N: Explosion-proof limit switch, 4-circuit (4NO+4NC), 3/4" NPT, neutral roller lever, complex interlock matrix duty
BXA3K-1A BXM8N: Explosion-proof limit switch, 1NO+1NC SPDT, 3/4" NPT, fork lever actuator, rotating shaft position detection
BXA3K-2A BXM8N: Explosion-proof limit switch, 2NO+2NC DPDT, 3/4" NPT, fork lever actuator, dual-output shaft sensing
BXA3K-1A BXM10N: Explosion-proof limit switch, 1NO+1NC SPDT, 3/4" NPT, wobble stick actuator, omnidirectional actuation geometry
BXA3K-2A BXM10N: Explosion-proof limit switch, 2NO+2NC DPDT, 3/4" NPT, wobble stick actuator, omnidirectional dual-circuit output

Quality Control for the BX Series Range

Inspection steps include: (1) visual examination of enclosure casting for cracks, corrosion, and conduit entry thread integrity; (2) continuity and insulation resistance testing on all contact circuits at 500VDC megohm test voltage; (3) snap-action mechanism verification — operating force, release force, and differential travel measured against Honeywell factory specification sheets; (4) actuator head alignment check and roller bearing condition assessment; (5) IP67 seal integrity verification via pressurized air test on enclosure joints; (6) functional cycle test — minimum 50 actuations under rated load to confirm contact bounce and wipe characteristics. Units that do not meet all acceptance criteria are quarantined and not offered for sale.

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