Electrical Connectors For Valve Solenoids

Product Overview

The ROSS Controls electrical connectors are DIN EN 175301-803 compliant connector assemblies designed specifically for use with ROSS solenoid valve coils. Available in Form A, Form B, and Form C configurations, this series provides engineers with the complete range of connector types needed to match any ROSS valve solenoid connection style from small compact valves to large inline poppet valves.

The Series includes both prewired connector assemblies with factory-attached 18-gauge two-meter cables and bare connector bodies for use with field-wired conduit installations. Prewired models are available with 6 mm and 10 mm cord diameters to suit different cable management requirements. Conduit entry versions accept standard 1/2 inch NPT electrical conduit fittings for installations requiring rigid conduit wiring.

A key feature of the series is the availability of LED indicator versions for Form A, Form B, and Form C configurations. Lighted connectors provide visual confirmation that the solenoid is energized, simplifying troubleshooting and commissioning by allowing technicians to verify valve actuation status without electrical test equipment. Lighted models are available for 24 VDC and 120 VAC coil voltages.

The Form C connectors in the series serve the smaller DIN coil format used on compact valves including ROSS size 0 valves, with cord diameter options of 5 mm and 8 mm. This variety ensures that design engineers can specify a single-source solution for all solenoid valve electrical connections across a complete pneumatic system.

Key Engineering Features

• DIN EN 175301-803 Form A, B, and C - Complete coverage of all DIN EN 175301-803 connector forms for compatibility with the full range of ROSS solenoid valve coil connection types.
• Factory Prewired 18-Gauge Cables - Prewired connectors include factory-attached 18-gauge two-meter (6.5 ft) cables with molded strain relief, eliminating field wiring time and ensuring reliable termination.
• LED Indicator Options - Lighted versions for 24 VDC and 120 VAC provide visual confirmation of solenoid energization for rapid troubleshooting and system commissioning without test instruments.
• Conduit Entry Option (Form A) - Connector versions with 1/2 inch NPT conduit entry accommodate rigid conduit wiring installations required by many industrial electrical codes and hazardous location applications.
• Micro-Mini Form (1766L77) - EN 175301-803 Micro-Mini format connector specifically designed for ROSS compact valve solenoids, available in lighted 24 VDC version for space-constrained installations.
• Multiple Cord Diameters - Prewired Form A connectors are available in 6 mm and 10 mm cord diameters to match common cable management system requirements and cable seal specifications.
• Surge Suppressor Caution - Connectors are designed for direct solenoid connection without surge suppressors; ROSS recommends against surge suppressor use as it increases valve de-actuation response time.
• Tool-Free Coil Replacement - DIN connector design enables quick-disconnect coil replacement in the field without hardwired connections, reducing valve maintenance time significantly.
• IP65-Compatible Designs - Form A connectors are compatible with IP65-rated solenoid housings, maintaining full ingress protection when correctly installed with appropriate sealing.
• Wide Voltage Compatibility - Connector bodies are voltage-independent; lighted versions are specified by voltage (24 VDC or 120 VAC) and can be mixed across a panel to suit the solenoid voltage used in the system.

Technical Specifications

General Specifications

Certifications & Compliance

Typical Applications & Industries

Machine Building and OEM Equipment

• New machine builds where solenoid valves are specified with DIN connector coils (blank coil code) and electrical connectors are ordered separately to match field wiring practices. Prewired Form A connectors with 6 mm cords are the most common choice for compact machine cabinet wiring.
• Production lines with multiple solenoid valves where technicians need rapid visual identification of energized solenoids during troubleshooting. Lighted Form A connectors (936K87-W for 24 VDC) provide per-valve indication without additional indicator lamps or I/O monitoring.
• Machines requiring conduit wiring per NEC or local electrical code requirements. Form A conduit connector (723K77 without light, 724K77-W lighted) accepts 1/2 inch NPT conduit for fully conduit-wired installations.

Maintenance, Repair, and Replacement

• Field replacement of damaged connectors on installed ROSS valves. The quick-disconnect DIN connector design allows connector replacement without valve removal or rewiring the solenoid coil.
• Upgrade of existing unlighted connectors to lighted versions for improved troubleshooting capability in maintenance programs. Direct connector body swap without coil or valve changes.
• Conversion of cable-connected installations to conduit installations during plant rewiring projects, replacing prewired connectors with conduit versions at the valve without replacing valves.

Panel Building and Control Systems Integration

• Panel builders specifying ROSS valve solenoid connections for custom industrial control panels. Prewired Form A 10 mm cord connectors (371K77) are commonly used when wiring runs exceed the 2-meter standard length and a cable extension is made at the panel.
• Safety-rated valve panels using DM2 or SV27 Series valves with DIN EN 175301-803 Form A coil connections, where 93 Series preassembled wiring kits are not used and individual connector selection is required.
• ISO 5599 base-mounted valve manifolds using individual solenoid connectors per valve station, particularly for manifolds with mixed valve functions requiring different solenoid connector types.

Process Industry and Instrumentation

• Chemical processing plants using ROSS inline poppet valves for corrosive gas control, where IP65 connectors with locking cord grips maintain environmental sealing in wet and chemical vapor environments.
• Pharmaceutical manufacturing installations where solenoid connector replacement can be validated and documented for GMP audit compliance using consistent ROSS parts.
• Food and beverage lines where washdown procedures require sealed connectors rated to IP65 and the lighted version provides visual system status confirmation during shift changeovers.

Ordering and Model Number Configuration

Form A connector: use for ROSS 21 Series, 27 Series, L-O-X lockout valves, and most ROSS inline poppet solenoid valves with DIN EN 175301-803 Form A coil openings.

Form B connector: verify valve coil type before ordering. Form B is physically incompatible with Form A valve openings.

Form C connector: use for ROSS compact valve series and size 0 valve solenoids. Confirm form type from valve data sheet.

Lighted connector voltage suffix: -W = 24 VDC; -Z = 120 VAC; -Y = 230 VAC (where available).

Do not use electrical connectors with surge suppressors, as this increases valve response time when de-actuating solenoids.

Conduit entry connectors (723K77 / 724K77-W / 724K77-Z) accept 1/2 inch NPT conduit fittings. Field-supplied conduit fittings are not included.

For DM2 Series and M35 Series double valves, SV27 Series, and RSe Series, refer to the 93 Series preassembled wiring kits for complete multi-conductor cable assemblies that connect control panels to valve stations.

Related Products & Accessories

• 92 Series Prewired Electrical Connectors - Factory-prewired DIN connector assemblies with longer cable lengths and additional options for complete solenoid valve wiring. https://www.rosscontrols.com/en/series/92-prewired-electrical-connectors
• 93 Series Preassembled Wiring Kits - Complete multi-conductor cable assemblies for DM Series, M35, SV27, and RSe Series valve stations with M12 and DIN connector options. https://www.rosscontrols.com/en/series/93-preassembled-wiring-kits
• 21 Series Inline Directional Control Valves - ROSS 21 Series poppet valves with DIN EN 175301-803 Form A coil connections compatible with Series connectors. https://www.rosscontrols.com/en/series/2759-lowhigh-temperatures-din-m12-connection-21-series
• L-O-X Lockout Valves - Manual lockout and exhaust valves with solenoid pilot options using DIN Form A connectors from the series. https://www.rosscontrols.com/en/series/1287-lockout-valves-15-series
• 90 Series Exhaust Silencers - Aluminum and stainless steel exhaust silencers for the pneumatic valves connected via Series electrical connectors. https://www.rosscontrols.com/en/series/90-silencers

Frequently Asked Questions (FAQ)

Q: How do I know which connector form I need for my ROSS valve?

A: Check the valve ordering information or data sheet for the coil connection type code. ROSS valves ordered with blank coil code or code 1 use Form A (DIN EN 175301-803 Form A). Form B and Form C are specified by separate codes. The coil connection type is always shown on the valve nameplate and in the ordering table of the relevant valve catalog.

Q: What is the difference between the 721K77 and 371K77 prewired connectors?

A: Both are Form A prewired connectors without lights, with 2-meter 18-gauge cables. The 721K77 has a 6 mm cord diameter and the 371K77 has a 10 mm cord diameter. Select based on the cable seal specification and available cord grip fitting sizes at the installation point.

Q: Can I add a lighted connector to a valve that currently has an unlighted connector?

A: Yes. Lighted and unlighted connectors are interchangeable on the same valve solenoid coil. Simply unplug the unlighted connector and plug in the lighted version. Lighted connectors for 24 VDC (-W suffix) or 120 VAC (-Z suffix) must match the coil operating voltage.

Q: What does the LED in a lighted connector indicate?

A: The LED illuminates when the connector is receiving voltage, confirming that the solenoid coil is energized. This provides direct at-valve indication that the control system has commanded valve actuation, helping technicians quickly identify whether a valve fault is electrical (no LED) or mechanical (LED on but valve not shifting).

Q: Why does ROSS recommend against using surge suppressors with these connectors?

A: Surge suppressors (transient voltage suppressor diodes or varistors) connected across solenoid coils slow the collapse of the magnetic field when power is removed. This delays the solenoid de-energization, increasing valve response time when transitioning from energized to de-energized. For safety valve applications this can affect circuit performance. ROSS solenoid coils are designed to operate without suppressors in standard applications.

Q: Are these connectors rated for IP65?

A: Form A connectors with properly tightened cord grip seals are compatible with IP65-rated ROSS solenoid valve enclosures. The complete assembly IP rating depends on correct installation of the cord grip seal against the cable jacket. Loose or improperly sized cord grips reduce the achieved protection level.

Q: Can I use 230 VAC lighted connectors?

A: Some models are available in 230 VAC lighted versions (-Y suffix). The 936K87-Y and 724K77-Y are available for Form A. Verify voltage requirement before ordering, as lighted connectors are voltage-specific.

Q: What is the EN 175301-803 Micro-Mini connector used for?

A: The Micro-Mini format (model 1766L77, lighted 24 VDC) is used on smaller ROSS valve solenoids that use a reduced-size DIN connector. Verify the valve solenoid coil connection type from the valve data sheet before selecting this format.

Q: Are replacement connectors stocked by ROSS distributors?

A: Yes. The Series connectors are standard catalog items stocked by ROSS Controls authorized distributors worldwide. Contact ROSS at (800) 438-7677 or a local distributor for availability and pricing.

Q: Do Form C connectors fit valves designed for Form A?

A: No. Form A and Form C use different body geometries and electrical pin configurations. They are not interchangeable. Always verify the form type from the valve data sheet or nameplate before ordering replacement connectors.

Q: What wire gauge are the prewired connectors?

A: All prewired Series connectors use 18 AWG wire in the factory-attached cable. This gauge is appropriate for solenoid currents up to approximately 6 amps over the standard 2-meter cable length. For longer runs, verify that voltage drop over the extended cable length remains within the solenoid coil operating voltage tolerance.

Q: Can I use Series connectors with non-ROSS valves?

A: Yes. The Series connectors comply with the DIN EN 175301-803 standard and are dimensionally compatible with any valve solenoid coil conforming to the same standard in Form A, B, or C. Verify the coil connection form and that the connector cord grip seals to the cable diameter used.

Installation & Maintenance Guidelines

• Verify connector form (A, B, or C) matches the valve solenoid opening before purchase and installation. The forms are physically keyed and cannot be interchanged.
• When installing prewired connectors, route cables to avoid sharp bends or kinking within 6 inches of the connector body. Maintain minimum bend radius of 10x the cord diameter for long-term cable life.
• For conduit versions, select appropriate cord grips or conduit fittings compatible with the installation environment and ingress protection requirements.
• After connecting, verify that the locking clip or retaining screw is properly engaged to prevent vibration-induced disconnection.
• Do not use extension cables with surge suppressor devices inline, as this will increase solenoid de-actuation time and may cause erratic valve performance.
• Lighted connectors draw a small amount of current for the LED indicator. Verify that the control system output can supply the combined solenoid current plus LED indicator current (typically less than 20 mA additional load).
• In wet or washdown environments, ensure connector cord grip seals are properly tightened against the cable jacket to maintain IP65 protection.

Warranty & Global Support

ROSS Controls provides a one-year warranty on all Series connectors, covering defects in material and workmanship from date of purchase.

Technical support is available through ROSS Controls USA at (800) 438-7677 (1-800-GET-ROSS) or the ROSS Technical Service line at 1-888-TEK-ROSS.

For complete product listings, data sheets, and cross-reference information, visit the ROSS Controls product page at rosscontrols.com.

Global support is available through ROSS offices in the USA, Canada, Brazil, Germany, France, United Kingdom, India, China, and Japan.

Download Catalog: https://www.rosscontrols.com/en/series/91-electrical-connectors