Prewired Electrical Connectors For Valve Solenoids

Product Overview

The ROSS Controls consists of factory-prewired electrical connector assemblies for use with ROSS solenoid valve coils conforming to DIN EN 175301-803. Unlike the 91 Series connector-only products, the series items arrive as complete prewired assemblies with factory-terminated cables, ready for direct connection to valve solenoids and control system wiring.

The Series prewired connectors are built to DIN EN 175301-803 Form A, Form B, and Form C specifications, covering the complete range of ROSS solenoid connection types. Standard cable length is 2 meters (6.5 feet) for Form A and Form B, with Form C available in both 2-meter and 3-meter lengths. Cable construction uses 18 AWG wire throughout.

Lighted versions incorporate LED indicators that illuminate when the connector is energized, providing immediate visual confirmation of solenoid actuation status. Lighted models are available for 24 VDC, 120 VAC, and 230 VAC systems, enabling technicians to verify valve switching from a distance during commissioning and routine maintenance without additional test instruments.

The Series supports all major ROSS valve families including the 21 Series, 27 Series, inline poppet valves, base-mount spool valves, and L-O-X lockout valves. For DM Series double valves and SV27/RSe Series safety valve stations, complete multi-cable preassembled wiring kits from the 93 Series provide the appropriate multi-conductor assemblies.

Key Engineering Features

• Factory-Prewired 18-Gauge Cables - All connectors arrive with factory-attached, factory-terminated 18 AWG cables in standard 2-meter (6.5 ft) or 3-meter lengths, eliminating field termination errors and reducing installation time.
• Form A, B, and C Coverage - Full product range covers DIN EN 175301-803 Form A (standard large body), Form B (alternate orientation), and Form C (compact small body for size 0 and compact valves).
• LED Lighted Versions - LED indicator variants for 24 VDC, 120 VAC, and 230 VAC provide per-valve visual energization status, reducing troubleshooting time during commissioning and fault finding.
• Multiple Cord Diameters - Form A prewired connectors available in 6 mm and 10 mm cord diameters to match cord grip and conduit fitting specifications at the installation point.
• Global Voltage Compatibility - Lighted connectors available for 24 VDC (W suffix), 120 VAC (Z suffix), and 230 VAC (Y suffix), covering North American and European industrial standard voltages.
• Compact Form C for Small Valves - Form C prewired connectors in 5 mm cord (short cable) and 8 mm cord (3-meter cable) address the compact solenoid openings on ROSS size 0 and other small-format valves.
• Direct-Plug Connection - Factory-attached cables with molded strain relief terminate in flying leads for direct connection to terminal blocks or control system I/O, with no intermediate splice or junction required.
• No Surge Suppressor Compatibility - Designed for direct valve solenoid connection. Surge suppressor devices in the wiring path increase solenoid de-actuation response time and should not be used with these connectors.
• IP65-Compatible Assembly - Form A prewired connectors with properly engaged cord grips maintain IP65 sealing at the valve solenoid connection when installed correctly.
• Standardized Model Numbers - Consistent model number structure with voltage suffix codes (-W for 24 VDC, -Z for 120 VAC, -Y for 230 VAC) simplifies ordering and inventory management across large installations with mixed voltages.

Technical Specifications

General Specifications

Certifications & Compliance

Typical Applications & Industries

Machine Tool and Metalworking

• CNC machining centers using multiple pneumatic axes controlled by solenoid valves. Prewired Form A connectors with 6 mm cords route through cable trays alongside motion control cables, with the factory-attached flying leads terminated directly to I/O terminal blocks in the machine control cabinet.
• Automatic tool changers and workholding fixtures where solenoid valve connectors must withstand repeated connection cycles during tool change sequences or pallet transfer operations.
• Coolant and lubrication system solenoid valves on machine tools where IP65 prewired connectors maintain ingress protection in metal cutting fluid splash environments.

Automotive Assembly Lines

• Body-in-white welding fixtures and clamp stations with arrays of solenoid valves. The 6 mm cord diameter 720K77-W lighted connectors are commonly specified so line technicians can visually scan a fixture and immediately identify deenergized clamps during troubleshooting.
• Paint shop conveyor systems and coating booth pneumatic actuators where the non-metallic connector body resists paint overspray and solvent vapors that corrode metal components.
• Final assembly line pneumatic tools and torque guns where prewired connector durability matches the high cycle count requirements of production line equipment.

Packaging and Material Handling

• High-speed packaging lines with solenoid valves cycling at rates above 10 Hz, where the prewired connector design eliminates field wiring joints that can fail from vibration over time.
• Palletizing and conveyor systems where the standard 2-meter cable length reaches control junction boxes without intermediate splicing in most machine frame configurations.
• Stretch wrapping and film cutting systems requiring 230 VAC solenoid valve connections served by the -Y suffix lighted connectors.

Water Treatment and Chemical Processing

• Valve islands and process control panels where individual solenoid valve connectors must resist condensation and humidity in outdoor or partially enclosed enclosures.
• Chemical dosing systems where the IP65-compatible prewired connectors prevent moisture ingress that would cause corrosion and electrical shorts in the solenoid connection.
• Wastewater treatment facilities where solenoid valves control air scouring blowers and actuators in high-humidity environments with intermittent washdown exposure.

Energy and Utilities

• Gas distribution and pipeline control applications where ROSS inline poppet valve solenoids require reliable electrical connections in field-mounted enclosures subject to temperature cycling and moisture.
• Power generation facilities using pneumatic control valves for turbine bypass and cooling system management, where the lighted connector provides local visual indication of valve state for operators making rounds.
• Substation pneumatic equipment controls where the standardized DIN connector interface simplifies documentation and spare parts stocking.

General Maintenance and Retrofit

• Replacement of damaged connectors on installed ROSS solenoid valves without dismounting valves from piping or machine structures. The factory-prewired design maintains consistent wiring quality compared to field-terminated replacements.
• Upgrading existing installations from unlighted to lighted connectors to improve diagnostic capability as part of predictive maintenance programs.
• Standardization of electrical connections across mixed valve installations by converting all solenoid connections to a single connector family and cable diameter for simplified spare parts management.

Ordering and Model Number Configuration

Select Form A, B, or C based on the valve solenoid coil connection type. Form A is used on the majority of ROSS valve series.

For lighted connectors, specify the voltage suffix: -W = 24 VDC; -Z = 120 VAC; -Y = 230 VAC. The connector body is identical; only the LED circuit varies.

Form A 6 mm cord (721K77 / 720K77-W / 720K77-Z) is the most common prewired connector for ROSS 21 Series and inline poppet valves.

Form A 10 mm cord (371K77 / 383K77-W / 383K77-Z) is used where larger cable management systems or conduit fittings require the wider cord diameter.

Form C 5 mm cord lighted connectors (2476K77-W / 2476K77-Z) are for compact valve solenoids where space is constrained and only the 5 mm cable can be accommodated.

Do not wire surge suppressor devices in series with these connectors. Surge suppressors increase solenoid de-actuation time.

For DM2 Series, M35, SV27, and RSe valve stations, the 93 Series preassembled wiring kits provide complete multi-cable assemblies specifically engineered for these valve types.

Related Products & Accessories

• 91 Series Electrical Connectors - Complete 91 Series includes connector-only, conduit entry, and prewired DIN EN 175301-803 connectors for all ROSS solenoid valve types. https://www.rosscontrols.com/en/series/91-electrical-connectors
• 93 Series Preassembled Wiring Kits - Multi-cable wiring assemblies for DM Series, M35, SV27, and RSe Series valve stations including solenoid and status indicator connections. https://www.rosscontrols.com/en/series/93-preassembled-wiring-kits
• 21 Series Inline Poppet Valves - Primary valve series using DIN EN 175301-803 Form A coil connections compatible with Series prewired connectors. https://www.rosscontrols.com/en/series/2759-lowhigh-temperatures-din-m12-connection-21-series
• 95 Series Mechanical Pressure Switches - Electrical energy release verification switches using DIN EN 175301-803 Form A connectors from the 91/Series. https://www.rosscontrols.com/en/series/95-mechanical-pressure-switches
• 90 Series Exhaust Silencers - Pneumatic exhaust noise reduction silencers commonly specified alongside solenoid valve connector assemblies. https://www.rosscontrols.com/en/series/90-silencers

Frequently Asked Questions (FAQ)

Q: What is the difference between the series prewired connectors and the 91 Series connectors?

A: The 91 Series includes both prewired connector assemblies and connector-only versions for field wiring with conduit. The Series specifically refers to factory-prewired assemblies with attached cables. In practice, both series share the same prewired connector model numbers (e.g., 721K77 appears in both). The 91 Series also includes conduit entry connectors (723K77, 724K77-W/Z) and connector-only versions (937K87, 372K77) not found in the prewired-only Series.

Q: Why is the standard cable length only 2 meters?

A: The 2-meter standard length is sufficient for most machine-mounted solenoid valve applications where the valve is located within 6 feet of a control junction box or terminal strip. For longer runs, the flying lead termination allows connection to a field junction box or terminal block from which a properly sized control cable continues to the panel.

Q: Are Form A prewired connectors in 6 mm and 10 mm cord electrically identical?

A: Yes. Both 6 mm cord (721K77) and 10 mm cord (371K77) Form A prewired connectors are electrically identical 18-gauge assemblies. The only difference is the cord outer diameter, which determines compatibility with cord grip fittings and cable management hardware.

Q: Can I order custom cable lengths?

A: Standard stocked lengths are 2 meters for Form A and Form B, and 2 or 3 meters for Form C. For custom lengths, contact ROSS Controls directly. Alternatively, the flying leads of a standard prewired connector can be extended with appropriate cable and connectors at the machine terminal block.

Q: What LED colors are used in lighted connectors?

A: ROSS lighted connectors typically use a red or amber LED indicator that illuminates when the solenoid is energized. The LED color provides sufficient visibility across a machine array for diagnostic purposes. Contact ROSS for specific current models and indicator colors.

Q: Are 230 VAC lighted connectors available for Form C?

A: Form C lighted prewired connectors are available for 24 VDC and 120 VAC. For 230 VAC Form C requirements, contact ROSS Controls to confirm current availability.

Q: How are the flying leads identified on prewired connectors?

A: Flying leads on 18-gauge prewired connectors are typically identified by insulation color. Common assignments: black and black carry the coil voltage (interchangeable for AC), and green/yellow is protective earth ground. Refer to the connector data sheet for the specific wire color coding of the model ordered.

Q: Can prewired connectors be used in explosive or hazardous locations?

A: Standard Series prewired connectors are not ATEX or NEC Division 1 certified. For hazardous location requirements, contact ROSS Controls for explosion-proof solenoid valve options. Separate conduit seals and hazardous location wiring methods are required when using standard connectors in classified areas with appropriate valve housings.

Q: What is the bend radius requirement for prewired cables?

A: Maintain a minimum cable bend radius of at least 10 times the cord outer diameter. For a 6 mm cord, minimum bend radius is 60 mm (approximately 2.4 inches). Sharper bends stress conductor insulation at the molded strain relief point and can cause premature cable failure.

Q: What happens if I accidentally install a Form A connector on a Form B valve?

A: The connectors are physically keyed to prevent incorrect mating. A Form A connector will not engage in a Form B coil opening and vice versa. If resistance is encountered during connector installation, verify the form type rather than forcing the connection.

Q: Are these connectors compatible with non-ROSS solenoid valves?

A: Yes. The Series connectors comply with DIN EN 175301-803 dimensional requirements and are compatible with any solenoid valve coil conforming to the same standard in the matching form. Verify the form type and that the connector cord grip diameter matches the cable being used.

Q: What is the maximum solenoid current these connectors can carry?

A: 18 AWG wire rated at standard industrial duty is suitable for solenoid currents up to approximately 6 amps continuous over a 2-meter cable. ROSS solenoid coils typically draw 0.1 to 0.5 amps. Verify actual solenoid current from the valve data sheet and confirm this is within the conductor capacity.

Installation & Maintenance Guidelines

• Identify the solenoid connector form (A, B, or C) from the valve data sheet or nameplate before ordering. The forms are physically keyed and cannot be interchanged.
• Route prewired cables to avoid sharp bends, kinking, or abrasion against machine edges. Maintain cable bend radius at minimum 10x the cord diameter.
• Connect flying leads to control system I/O terminal blocks per the solenoid coil polarity labeling. For AC coils, polarity is not critical; for DC coils, ensure correct polarity to prevent coil damage.
• In vibration-prone environments, secure cables at intervals not exceeding 12 inches to prevent connector body stress from cable movement.
• Verify cord grip engagement against the cable jacket to maintain IP65 sealing integrity in wash-down or humid environments.
• After installation, verify LED operation (on lighted versions) by energizing the control output and confirming indicator illumination at the valve.
• For 3-meter Form C prewired connectors in tight conduit runs, ensure the longer cable does not create excess slack that could be pinched or kinked.

Warranty & Global Support

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

Technical assistance is available at Customer Service: 1-800-GET-ROSS; Technical Service: 1-888-TEK-ROSS.

Visit rosscontrols.com for the complete 91/Series data sheet, connector cross-reference by valve type, and online ordering.

Download Catalog: https://www.rosscontrols.com/en/series/92-prewired-electrical-connectors