RH7127Y-2.8-21/8-968972-2 12 V / 24 V, 12 Position, Automotive Housing for Female Terminals

Detailed Product Description

The RH7127Y-2.8-21/8-968972-2 is a high-performance, non-sealable 12-position plastic housing connector engineered for 12V and 24V automotive and commercial vehicle wire-to-wire applications. Designed specifically for female terminals with a 2.8mm contact system, this rectangular connector features a 3-row, 12-position configuration, a gray housing with keying code A, and an extended operating temperature range from -40°C to 120°C. Built with a glass-filled PBT housing and integrated primary locking, this connector delivers reliable, high-density signal and low-power distribution in demanding environments.

Product Type Features

This connector features a rectangular shape, providing efficient space utilization and ease of handling during harness assembly. It is a non-mixed, non-hybrid connector, meaning all 12 positions accept identical 2.8mm female receptacle terminals, simplifying inventory management and assembly processes. 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 or protected underhood environments where moisture ingress is not a primary concern, while offering cost advantages compared to sealed alternatives.

Configuration Features

The housing provides 12 positions arranged in 3 rows. This three-row configuration offers a significant increase in contact density compared to 2-row designs, allowing more circuits to be routed through a compact footprint. The 3-row layout is ideal for applications requiring multiple signal or low-power connections in a space-constrained environment.

Electrical Characteristics

This connector is uniquely rated for dual nominal voltage architectures: 12V and 24V. The operating voltage (VDC) is specified at 28V, providing margin above both 12V and 24V nominal systems. This dual-voltage capability makes the connector exceptionally versatile:

12V systems – standard passenger cars, light-duty vehicles, and consumer automotive applications

24V systems – heavy-duty trucks, commercial vehicles, buses, construction equipment, agricultural machinery, and marine applications

The 28V operating rating ensures reliable performance even with voltage spikes and alternator ripple common in both 12V and 24V electrical architectures.

Body Features

The cable exit angle is 180° (straight) , facilitating straightforward cable management and minimizing bend stress on wires exiting the housing. The primary product color is gray – this distinguishes the connector from black counterparts, aiding in visual identification during assembly and service. The connector & keying code is A, indicating a specific keying configuration to prevent mismating with other connectors in the same family. Keying code A is typically the primary or default orientation in multi-keying systems.

Contact Features

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 and industrial connectors. The 2.8mm contact system offers several advantages:

Higher current capacity compared to 1.8mm or 1.5mm signal contacts

Robust mechanical strength and durability

Wide availability of mating terminals and tooling

Proven reliability in high-vibration environments

The receptacle contact design provides reliable, low-resistance electrical connection when mated with corresponding 2.8mm male tabs.

Mechanical Attachment

Mating alignment is provided with a keyed alignment type. Keyed connectors use asymmetric plastic features that physically prevent incorrect mating or cross-mating with connectors having different keying codes. This is essential for multi-harness systems where multiple connectors may be in close proximity. The keying feature ensures that only connectors with matching keying codes (in this case, code A) can be mated.

Terminal Position Assurance (TPA) is not provided (No) . Without TPA, proper terminal insertion relies on the primary locking feature integrated into the housing. Installers should ensure terminals are fully seated until an audible or tactile click confirms engagement.

Strain relief is not provided (Without) – for applications with significant cable movement or vibration, external strain relief (cable ties, conduits, or backshells) is recommended.

The connector mounting type is Cable Mount (Free-Hanging) , offering maximum flexibility for harness assembly without requiring panel or PCB mounting. This makes the connector ideal for in-line connections between wire harnesses.

Housing Features

The housing is manufactured from Glass-Filled Polybutylene Terephthalate (PBT) . Glass-filled PBT provides exceptional mechanical and thermal properties:

Higher mechanical strength – glass fibers increase tensile and flexural strength, critical for 3-row connectors that experience greater insertion forces

Excellent dimensional stability – maintains precise 5mm pitch and terminal alignment even after repeated thermal cycling

High heat deflection temperature – retains rigidity at 120°C maximum operating temperature

Superior creep resistance – prevents terminal loosening over time due to material relaxation

Chemical resistance – withstands exposure to automotive fluids, oils, fuels, and cleaning solvents

The centerline (pitch) between adjacent contacts is 5 mm (0.197 in) . This 5mm pitch offers several benefits:

Ample electrical creepage and clearance for 28V operation (with margin for voltage spikes)

Compatibility with industry-standard 2.8mm terminal systems

Sufficient material between cavities for robust housing strength in 3-row configuration

Accommodation of appropriately sized wire gauges for 2.8mm contacts

Dimensions – Compact High-Density Design
Connector Height: 24 mm (0.945 in)

Product Length: 26 mm (1.024 in)

Product Width: 26 mm (1.024 in)

Despite holding 12 positions across 3 rows, the RH7127Y-2.8 maintains a remarkably compact 26mm x 26mm footprint (approximately 1 inch square) with a low 24mm height. This near-cube shape provides excellent space efficiency for dense harness assemblies. The 24mm height is significantly lower than many comparable 12-position connectors, making it suitable for routing in tight spaces between chassis components, under dashboards, or within equipment enclosures.

Applications

This 12V/24V, 12-position connector is ideal for:

Commercial vehicle lighting systems – headlamps, tail lamps, turn signals, marker lights

Heavy-duty truck cab interface connectors – dash-to-door, cab-to-chassis connections

Bus and coach electrical distribution – passenger lighting, HVAC controls, door systems

Construction equipment harnesses – excavators, loaders, bulldozers

Agricultural machinery – tractors, combines, sprayers

Marine applications (24V systems) – navigation lights, pumps, control circuits

Industrial control panels – equipment interconnects and sensor networks