Honeywell SZR-LY2-N1 110VAC Ruggedized DPDT Relay Harsh Env

Product Overview

Honeywell SZR-LY2-N1 110VAC Ruggedized DPDT Relay for Harsh Industrial Environments

The Honeywell SZR-LY2-N1 110VAC is a ruggedized double-pole double-throw (DPDT) general-purpose relay engineered for continuous, reliable operation in the most demanding industrial environments. Designed as part of Honeywell’s proven SZR Series, this 8-pin octal relay delivers consistent switching performance under conditions of high temperature, elevated humidity, heavy vibration, airborne particulates, and electromagnetic interference — making it a trusted backbone component in control panels, PLC I/O circuits, and safety interlock systems across heavy industry.

Rugged Specifications Table

Comprehensive Protection Solutions

In modern industrial control architectures, the Honeywell SZR-LY2-N1 110VAC relay rarely operates in isolation. It is most commonly deployed as an interface relay between a Siemens S7-300 or S7-1500 PLC digital output card and field devices, providing galvanic isolation that protects sensitive CPU modules from inductive load spikes. When paired with a Honeywell SZF-08A octal socket mounted on a DIN rail, installation and replacement become tool-free operations — critical for minimizing downtime on continuous production lines.

In distributed control system (DCS) environments, this relay is frequently used alongside Honeywell Experion PKS I/O modules and Yokogawa CENTUM VP field control stations to buffer relay-driven outputs from high-current actuators. The SZR-LY2-N1’s arc suppression design significantly reduces contact erosion when switching inductive loads such as solenoid valves, motor starters, and contactor coils — extending the service life of adjacent Schneider Electric TeSys contactors and ABB AF-series contactors in the same panel.

For applications requiring enhanced safety integrity, the SZR-LY2-N1 is often integrated into safety relay circuits alongside Pilz PNOZ X safety relays and Siemens 3SK1 safety relay modules, where its DPDT configuration enables forced-guided contact monitoring. In communication-intensive panels, it works in concert with Phoenix Contact QUINT-series power supplies to ensure stable 110VAC coil energization even during bus voltage fluctuations on PROFIBUS or PROFINET segments. Terminal blocks such as Weidmüller WDU 2.5 series are commonly used to wire the octal socket into the panel, providing vibration-resistant, screw-clamp terminations that maintain contact integrity in high-vibration environments like compressor stations and rolling mills.

Application in Critical Infrastructure

The Honeywell SZR-LY2-N1 110VAC has established a strong track record across critical infrastructure sectors where relay failure is not an option:

Oil & Gas: Deployed in wellhead control panels and pipeline SCADA systems, this relay handles emergency shutdown (ESD) interlock circuits where coil energization must remain stable despite wide ambient temperature swings (-20°C to +60°C) and persistent vibration from pumping equipment. Its sealed coil construction resists hydrocarbon vapors and H₂S-laden atmospheres common in upstream processing facilities.

Mining & Mineral Processing: In underground conveyor control systems and surface crusher automation panels, the SZR-LY2-N1 withstands coal dust ingress, high mechanical shock from blasting operations, and the electromagnetic noise generated by large variable frequency drives (VFDs) controlling conveyor motors. Its 300 m/s² shock rating ensures contact integrity even in proximity to heavy machinery.

Power Generation & Utilities: Thermal and hydroelectric power plants rely on this relay for turbine governor interlock circuits and generator protection panels. The 2,000 VAC dielectric strength between coil and contacts provides the isolation margin required by IEC 61511 functional safety standards for SIL-rated protection loops.

Water & Wastewater Treatment: Pump station control panels in municipal water treatment facilities use the SZR-LY2-N1 to switch motor starter circuits for submersible pumps, where high ambient humidity (up to 85% RH) and chemical vapors from chlorination processes demand robust insulation and corrosion-resistant contact materials.

Metallurgy & Steel Production: In electric arc furnace (EAF) control systems and continuous casting lines, this relay operates reliably despite extreme electromagnetic interference from high-current bus bars and induction heating equipment, maintaining switching accuracy in PLC-controlled cooling water and hydraulic press circuits.

Security & Quality FAQ

Q1: What does the 12-month warranty cover, and how is it processed?
All units shipped from TOPNLMS carry a 12-month warranty covering manufacturing defects, premature contact failure, and coil burnout under rated operating conditions. If a defect is confirmed within the warranty period, we provide a full replacement unit or a refund — your choice. Simply contact us at [email protected] with your order number and a brief fault description to initiate the process.

Q2: How is each unit tested before shipment?
Every SZR-LY2-N1 110VAC unit undergoes pre-shipment functional testing: coil energization at rated voltage, contact continuity verification across both poles, insulation resistance check (≥1,000 MΩ), and visual inspection for mechanical damage. Units that fail any test are quarantined and not shipped. A test record is available upon request for critical procurement applications.

Q3: Is this relay compatible with third-party octal sockets and existing panel wiring?
Yes. The SZR-LY2-N1 follows the standard IEC 60335 8-pin octal footprint, making it mechanically and electrically compatible with octal sockets from Omron (PYF08A), Finder (90.03), and other major manufacturers, in addition to the native Honeywell SZF-08A/SZF-08B sockets. This ensures drop-in replacement capability without rewiring existing control panels.

Q4: Can you guarantee long-term supply and support for ongoing maintenance contracts?
TOPNLMS maintains dedicated stock of SZR Series relays and related Honeywell automation components to support long-term maintenance and spare-parts programs. We serve OEMs, system integrators, and plant maintenance teams requiring consistent supply across multi-year service contracts. For volume pricing, lead-time commitments, or approved vendor qualification, contact our technical sales team directly.