Honeywell SZR-LY2 Modules — SZR-LY2-N1 110VAC

Technical Dossier

Product Details And Specifications

Honeywell SZR-LY2 Series: Comprehensive Module Range and Technical Overview

The Honeywell SZR-LY2 series is a line of general-purpose plug-in relays engineered for industrial control panel integration across heavy-process industries including petrochemical plants, oil refineries, nuclear power facilities, and continuous-process manufacturing. These relays are designed to interface with Honeywell's distributed control system (DCS) architectures and third-party PLC I/O marshalling panels, providing reliable electromechanical switching in environments where signal isolation, coil voltage flexibility, and long service life are mandatory specifications. The SZR-LY2 platform supports DPDT (double pole double throw) contact configurations, making it a standard selection for interposing relay applications in safety instrumented systems (SIS) and basic process control systems (BPCS). Its compact footprint and compatibility with standard 8-pin octal sockets (PTF08A and equivalents) have made it a persistent catalog item in global MRO (maintenance, repair, and operations) procurement for facilities with installed base dating back to the 1990s.

The Evolution of SZR-LY2 Architecture

The SZR-LY2 series traces its lineage to Honeywell's broader SZR relay platform, which was developed to meet IEC 61810 and NEMA standards for electromechanical relays used in industrial automation. Early variants of the SZR-LY2 were introduced with a limited coil voltage range (primarily 24VDC and 110VAC), targeting the dominant control voltage standards of North American and European process plants. As DCS architectures evolved through the 1990s and 2000s — from Honeywell's TDC 3000 and PlantScape systems to the Experion PKS platform — the SZR-LY2 series expanded its coil voltage options to include 12VDC, 24VAC, 48VDC, 100VAC, 110VAC, 120VAC, 200VAC, and 240VAC variants, enabling direct compatibility with diverse marshalling cabinet voltage rails across global installations. The DPDT contact architecture remained consistent across generations, preserving backward compatibility with existing socket infrastructure. By the 2010s, the SZR-LY2 series entered a mature lifecycle phase. Honeywell's primary relay catalog shifted emphasis toward solid-state and hybrid relay solutions for new greenfield projects, while the SZR-LY2 continued to be specified for brownfield maintenance and like-for-like replacement in existing installations. Facilities operating legacy Honeywell DCS systems — particularly those with TDC 3000 or Experion R100–R400 vintage hardware — continue to require SZR-LY2 stock as a critical MRO spare. Compatibility with the PTF08A octal socket and equivalent third-party sockets (Omron P2RF-08, Finder 94.74) ensures that SZR-LY2 units can be sourced from multiple supply channels without panel modification.

SZR-LY2 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified SZR-LY2 series catalog. All units are DPDT, 10A contact rating, 250VAC/30VDC contact voltage, 8-pin octal plug-in format unless otherwise noted. Classified by coil voltage:

DC Coil Variants

• SZR-LY2-N1 12VDC: DPDT general-purpose relay, 12VDC coil, 10A/250VAC contacts, octal socket mount.
• SZR-LY2-N1 24VDC: DPDT relay, 24VDC coil — most common DC variant for DCS I/O marshalling panels.
• SZR-LY2-N1 48VDC: DPDT relay, 48VDC coil, used in telecom-adjacent process control panels.
• SZR-LY2-N1 100VDC: DPDT relay, 100VDC coil, specified for high-voltage DC bus control circuits.
• SZR-LY2-N1 110VDC: DPDT relay, 110VDC coil, common in substation and utility control panels.

AC Coil Variants

• SZR-LY2-N1 6VAC: DPDT relay, 6VAC coil, low-voltage AC control applications.
• SZR-LY2-N1 12VAC: DPDT relay, 12VAC coil, panel lighting and auxiliary control circuits.
• SZR-LY2-N1 24VAC: DPDT relay, 24VAC coil, HVAC and building automation integration.
• SZR-LY2-N1 48VAC: DPDT relay, 48VAC coil, mid-range AC control voltage for legacy panels.
• SZR-LY2-N1 100VAC: DPDT relay, 100VAC coil, Japanese industrial standard voltage compatibility.
• SZR-LY2-N1 110VAC: DPDT relay, 110VAC coil — North American standard AC control voltage; the subject SKU of this listing.
• SZR-LY2-N1 120VAC: DPDT relay, 120VAC coil, UL-listed variant for North American NEC-compliant panels.
• SZR-LY2-N1 200VAC: DPDT relay, 200VAC coil, Japanese 200V single-phase industrial standard.
• SZR-LY2-N1 220VAC: DPDT relay, 220VAC coil, European and Asian industrial panel standard.
• SZR-LY2-N1 240VAC: DPDT relay, 240VAC coil, UK and Australian mains-voltage control circuits.
• SZR-LY2-N1 277VAC: DPDT relay, 277VAC coil, US commercial lighting control panel applications.

Associated Socket & Accessory SKUs

• PTF08A: 8-pin octal DIN-rail/panel-mount socket, standard mating socket for all SZR-LY2-N1 variants.
• PTF08A-E: 8-pin octal socket with hold-down clip, for vibration-prone installations.

Sourcing Hard-to-Find & Obsolete SZR-LY2 Parts

The SZR-LY2 series is classified as a mature/end-of-active-production product line within Honeywell's relay catalog. While select variants remain available through authorized distribution channels, specific coil voltage configurations — particularly 6VAC, 48VAC, 100VDC, and 277VAC — are subject to extended lead times or confirmed discontinuation. DriveKNMS maintains a dedicated inventory of SZR-LY2 series units sourced through verified industrial surplus, OEM overstock, and controlled decommissioning channels. All units are subject to pre-shipment inspection protocols before dispatch. For facilities operating under long-term service agreements (LTSA) or requiring multi-year MRO stocking plans for Honeywell DCS installations, DriveKNMS provides lifecycle extension support including: bulk quantity reservation, condition-graded inventory (new-in-box, refurbished-tested, and pull-tested), cross-reference to functional equivalents (Omron LY2N, Finder 55.32, Idec RH2B-U series), and documentation packages for maintenance records. Procurement teams managing Honeywell Experion PKS, TDC 3000, or PlantScape installations are advised to establish standing purchase orders for SZR-LY2 variants to mitigate supply chain risk as the series approaches end-of-life status.

Quality Control for the SZR-LY2 Range

Each SZR-LY2 unit processed by DriveKNMS undergoes a structured inspection and functional test sequence prior to shipment. The test protocol addresses the specific failure modes associated with electromechanical plug-in relays in long-term storage or field-removed condition: coil resistance measurement (verified against Honeywell factory specification ±10%); contact resistance measurement across all four contact sets (NO and NC) using a four-wire milliohm meter; dielectric withstand test (hi-pot) at 2,000VAC between coil and contact circuits; mechanical operation verification — minimum 10 operate/release cycles under rated coil voltage with oscilloscope-verified contact bounce timing; visual inspection of contact surfaces, coil terminations, and plastic housing for arc damage, corrosion, or mechanical deformation; and socket pin condition check for units supplied with PTF08A sockets, including pin retention force measurement. Units that fail any parameter are quarantined and not shipped. Test records are retained and available upon request for quality-critical procurement processes including nuclear, pharmaceutical, and offshore applications.

For SZR-LY2-N1 110VAC availability, bulk pricing, and lifecycle support inquiries:

• Email: [email protected]
• WhatsApp: +86 18359293191
• Web: driveknms.com