RH7071B-3.5-21/282194-1 24 V, 7 Position, Automotive Housing for Female Terminals

Detailed Product Description

The RH7071B-3.5-21/282194-1 is a high-current, non-sealable 7-position automotive housing connector specifically engineered for 24V wire-to-board power applications. This rectangular connector features a unique single-row (1-row) configuration with 7 positions, specifically designed for 2.8mm female receptacle terminals with a flexible current rating of 20A or 30A per contact depending on application requirements. Featuring a black PA 6.6 housing, locking lance primary locking feature, polarizing slot for mating alignment, and a long, narrow form factor with dimensions of 50.4mm in length and 38.2mm in width, this connector delivers robust power transmission capability in commercial vehicle, truck, bus, and industrial equipment applications across an extreme temperature range of -40°C to 130°C.

Product Type Features

This connector features a rectangular shape, providing efficient space utilization. It is a non-mixed, non-hybrid connector, meaning all 7 positions accept identical 2.8mm female receptacle terminals, simplifying inventory management. As a housing for female terminals, it is designed to mate with corresponding male terminal housings or headers. The connector is non-sealable (Sealable: No) , making it suitable for interior, under-dash, or dry underhood environments.

The primary locking feature is Locking Lance – a flexible plastic beam molded into the housing that engages with the terminal to retain it. This proven retention mechanism is widely used in automotive power connectors. The connector system is wire-to-board, specifically designed to connect wiring harnesses to printed circuit boards. The connector terminates to wire and cable, making it versatile for harness assembly.

Configuration Features – Unique 7-Position Single-Row Design

The housing provides 7 positions arranged in 1 row. This single-row, 7-position configuration is a distinctive design that offers several advantages:
Easy terminal access – all 7 terminals are visible and accessible from one side
Simplified inspection – visual verification of terminal insertion is straightforward
Low profile – single-row design allows for efficient use of space in certain orientations
Daisy-chain friendly – ideal for applications requiring multiple connections along a wiring run
Unique 7-position count – perfectly suited for applications requiring 7 circuits without wasted positions
The 7-position count is a specific solution for applications that need 7 power or signal circuits, avoiding the extra size and cost of an 8-position connector or the limitation of a 6-position connector.

Electrical Characteristics – 24V Dedicated System

This connector is rated for 24V nominal voltage architecture with an operating voltage of 24 VDC. This makes it specifically designed for:
24V systems – heavy-duty trucks, commercial vehicles, buses, construction equipment, agricultural machinery, marine applications, and industrial equipment
Unlike dual-voltage or triple-voltage connectors, the RH7071B-3.5 is optimized specifically for 24V systems, ensuring optimal creepage, clearance, and insulation for this voltage level.

Body Features – Black Housing

The cable exit angle is 180° (straight) , facilitating straightforward cable management and minimizing bend stress on wires. The primary product color is Black, providing a professional appearance along with good UV resistance and thermal stability.

Contact Features – 2.8mm with Dual Current Rating (20A | 30A)
The housing accepts receptacle-type contacts (female terminals) with a contact size of 2.8mm. The mating tab width is precisely 2.8 mm (0.11 in) , a widely used standard in automotive power connectors.

The contact current rating (max) is 20A | 30A – this dual rating indicates flexibility based on application conditions:

30A rating – achievable with appropriate wire gauge (typically 12 AWG), optimal crimping, and lower ambient temperatures

20A rating – conservative rating for higher ambient temperatures, smaller wire gauges (14-16 AWG), or high-reliability applications requiring extra margin

The 30A maximum rating enables the connector to handle demanding power applications including:

The 30A maximum rating enables the connector to handle demanding power applications including:
Heavy-duty lighting circuits (headlamps, work lights, warning beacons)
Electric motors (HVAC blowers, cooling fans, actuators)
Solenoids and power relays
Power distribution junctions
Battery charging circuits

Mechanical Attachment

Mating alignment is provided with a polarizing slot alignment type. A polarizing slot is a specific geometric feature (a slot or groove) molded into the housing that works with a corresponding rib on the mating connector to ensure correct orientation. This provides:
Positive polarization – physical prevention of reverse or incorrect mating
Visual alignment aid – easy to see when properly aligned
Smooth mating – guides the mating connector into correct position

Terminal Position Assurance (TPA) is not provided (No) . Proper terminal insertion relies on the locking lance primary locking feature – installers should ensure terminals are fully seated until an audible click confirms engagement.

Strain relief is not provided (Without) – for high-vibration applications, external strain relief is recommended.

The connector mounting type is Cable Mount (Free-Hanging) , offering maximum flexibility for harness assembly. The connector is designed to mount to the end of a cable harness and then plug into a board-mounted header.

Housing Features – PA 6.6 Material

The housing is manufactured from PA 6.6 (Polyamide 6.6/Nylon 6.6) . PA 6.6 is a premium high-performance engineering plastic offering:
Higher melting point (approx. 260°C) – maintains structural integrity at 130°C maximum operating temperature
Excellent mechanical strength and stiffness – resists deformation under use
Superior heat aging resistance – maintains properties after extended high-temperature exposure
Good chemical resistance – withstands automotive fluids including engine oil, fuel, coolant
Low moisture absorption compared to PA 6 – provides better dimensional stability
High impact resistance – durable in high-vibration environments
The centerline (pitch) between adjacent contacts is 5 mm (0.197 in) . This 5mm pitch provides:
Adequate electrical spacing – sufficient creepage and clearance for 24V systems
Industry standard compatibility – 5mm pitch is common in automotive power connectors
Accommodates appropriate wire gauges – suitable for 12-16 AWG wires used with 20-30A currents

Dimensions – Long, Narrow Form Factor

Connector Height: 24.5 mm (0.96 in)
Product Length: 50.4 mm (1.98 in) – notably long for a 7-position single-row connector
Product Width: 38.2 mm (1.504 in)
The RH7071B-3.5 features a distinctive long, narrow form factor:
Length of 50.4mm (approximately 2 inches) – this is the longest dimension, running along the single row of 7 contacts
Width of 38.2mm (approximately 1.5 inches) – the shorter dimension across the connector body
Height of 24.5mm (approximately 0.96 inches) – moderate profile providing robust housing walls

This long, narrow shape is ideal for applications where space is limited in one direction but available along the length of the wiring run – such as along chassis rails, inside equipment enclosures, or on din-rail mounted devices.