OMRON MY Series Power Relays

Technical Dossier

Product Details And Specifications

OMRON MY Series Power Relays: Comprehensive Module Range and Technical Overview

The OMRON MY Series is a standardized general-purpose power relay line that has maintained a dominant installed base across global heavy industry for over four decades. Deployed in chemical processing plants, oil refineries, nuclear auxiliary control panels, and discrete manufacturing lines, the MY Series serves as the switching backbone for control circuits operating at 6V DC through 240V AC. Its DIN-rail and socket-mount compatibility — via the PY and PTF socket families — makes it a universal fit for both legacy relay logic panels and modern PLC output expansion racks. The series is fully cross-referenced against equivalent relay families from Finder, TE Connectivity, and Schneider Electric, making it a preferred substitute in multi-vendor MRO environments.

The Evolution of MY Series Architecture

The MY Series was introduced in the 1970s as a plug-in relay designed for socket-based panel wiring, eliminating the need for direct terminal soldering. The original MY2 and MY4 frames established the 8-pin and 14-pin octal/blade footprints that remain the global standard today. In the 1980s, OMRON introduced the NJ suffix variants — including the MY4NJ — adding a mechanical indicator flag and a manual override button. These features became mandatory in safety-critical relay panels under IEC 61810 and JIS C 5442 standards.

Through the 1990s and 2000s, the series expanded to include bifurcated contact versions (MY-□GS) for low-level signal switching below 1A, and LED indicator variants optimized for 24V DC PLC panels. The MY□ZS sub-series added a built-in varistor surge suppressor for inductive load protection without external components. As of 2026, the MY Series is in its mature lifecycle phase: all core models remain in production, but OMRON has designated several socket types as last-time-buy. DriveKNMS maintains buffer stock of both active and end-of-life socket variants to support long-term maintenance contracts across petrochemical, power generation, and discrete manufacturing sectors.

MY Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified active and legacy catalog of the OMRON MY Series, classified by pole configuration and feature set. All models use the standard blade-pin socket interface (PYF/PTF family).

2-Pole (DPDT) Models — 8-Pin, 10A:

• MY2: 2-pole, 10A, standard coil, no indicator — base model for general-purpose switching circuits.
• MY2N: 2-pole, 10A, with LED indicator and flyback diode — standard for 24V DC control panels.
• MY2NJ: 2-pole, 10A, mechanical indicator flag + manual override button — IEC 61810 panel standard.
• MY2IN: 2-pole, 10A, with built-in surge suppressor — inductive load protection, no external components required.
• MY2ZS: 2-pole, 10A, with integrated varistor — AC coil variant for inductive load environments.
• MY2GS: 2-pole, bifurcated gold-clad contacts — low-level signal switching below 1A, instrumentation panels.

3-Pole (3PDT) Models — 11-Pin, 10A:

• MY3: 3-pole, 10A, standard coil — three-phase auxiliary switching in MCC and switchgear panels.
• MY3N: 3-pole, 10A, with LED indicator — visual status confirmation in motor control center panels.
• MY3NJ: 3-pole, 10A, mechanical indicator + manual override — safety panel and interlock circuit standard.
• MY3IN: 3-pole, 10A, with built-in surge suppressor — motor starter auxiliary and contactor control circuits.

4-Pole (4PDT) Models — 14-Pin, 5A:

• MY4: 4-pole, 5A, standard coil — high-density relay logic panels, 14-pin blade socket.
• MY4N: 4-pole, 5A, with LED indicator and flyback diode — 24V DC PLC output relay expansion panels.
• MY4NJ: 4-pole, 5A, mechanical indicator flag + manual override button — reference SKU for this listing; IEC 61810 compliant, 14-pin blade, rated 250V AC / 5A, coil voltages: 6V DC to 240V AC.
• MY4IN: 4-pole, 5A, with built-in surge suppressor — coil transient suppression without external varistor or diode.
• MY4ZS: 4-pole, 5A, with integrated varistor — AC coil variant for inductive load switching environments.
• MY4GS: 4-pole, bifurcated gold-clad contacts — low-level signal relay for instrumentation and SCADA interface panels.

Compatible Socket Accessories (Verified Cross-Reference):

• PYF08A: 8-pin DIN-rail or surface-mount socket — compatible with MY2 family.
• PYF14A: 14-pin DIN-rail socket, screw terminals — compatible with MY4 family.
• PTF08A: 8-pin panel-board socket with hold-down clip — MY2 family, surface mount.
• PTF14A: 14-pin panel-board socket with hold-down clip — MY4 family, surface mount.
• PYF11A: 11-pin DIN-rail socket — compatible with MY3 family.

Sourcing Hard-to-Find & Obsolete MY Series Parts

DriveKNMS operates a dedicated lifecycle support program for the OMRON MY Series, with particular focus on socket variants and coil voltage configurations that have been discontinued or placed on last-time-buy status by OMRON. Common hard-to-source configurations include 6V DC, 12V DC, and 100V AC coil variants, as well as the MY□GS bifurcated contact models used in legacy instrumentation and SCADA interface panels.

Our sourcing process for obsolete MY Series parts includes: verification against OMRON's official part number structure, cross-reference against equivalent Finder 55 Series and TE Connectivity RT Series models where direct substitution is confirmed, and physical inspection of date codes to exclude counterfeit or re-marked stock. All sourced units are stored in ESD-safe, humidity-controlled warehousing. For plant maintenance teams operating under long-term service agreements, DriveKNMS can provide consignment stock arrangements for high-consumption MY Series SKUs, including the MY4NJ, MY2NJ, and MY4N.

Quality Control for the MY Series Range

Each MY Series relay processed through DriveKNMS undergoes a structured inspection protocol adapted to the relay's contact architecture and coil specification:

• Coil resistance measurement: Verified against OMRON published nominal values (±10% tolerance) using a calibrated Kelvin bridge meter.
• Pick-up and drop-out voltage test: Coil energization sweep from 0V to rated voltage to confirm switching thresholds meet IEC 61810-1 Class F requirements.
• Contact resistance test: Each pole measured at 6V DC / 1A using a four-wire milliohm meter; acceptance threshold <100mΩ for standard contacts, <50mΩ for GS bifurcated contacts.
• Mechanical indicator and override function check: For NJ suffix models including the MY4NJ, the manual override button and flag indicator are actuated and verified for correct operation per OMRON service documentation.
• Insulation resistance test: 500V DC megohm test between coil and contacts; minimum 100MΩ acceptance criterion per IEC 61810-1.
• Socket fit verification: Each relay is test-seated in the corresponding PYF or PTF socket to confirm blade engagement force and retention clip function before shipment.