Raychem Coupling Connectors 24kV

RSTI-5851 Screened Separable Connector (Raychem 24 kV, 1250 A)

The RSTI-5851 is a Raychem screened separable connector from the TE Connectivity RSTI range, rated for 24 kV system voltage at 1250 A continuous current. It is used to connect single-core polymeric MV cable to transformer and switchgear bushings on the 24 kV class, the most common MV voltage on the Irish distribution network. Powerpoint Engineering supplies the RSTI-5851 (part CM0009-005) to utilities, MV cable contractors, and renewable site installers terminating MV cable into bushing-type C interfaces, where a separable connector is preferred over a fixed termination for maintenance and operational flexibility.

Where the higher-class RSTI-6853 covers the 36 / 42 kV system voltages, the RSTI-5851 is the right choice for the 24 kV networks that dominate Irish MV distribution. Same Raychem screened separable principles, same Interface C bushing format, sized and certified for 24 kV.

What the RSTI-5851 is and what it does

• Screened separable connector: shielded outer surface for safe touch operation when correctly earthed.
• 24 kV class rated: covers the standard 22 / 24 kV system voltages used on Irish MV distribution.
• 1250 A continuous current rating: suitable for higher-current MV applications where 630 A connectors are not enough.
• Interface C bushing: mates with bushing-type C interfaces specified by IEC EN 50181 on transformers, switchgear, and ring main units.
• Single-core polymeric cable: designed for screened single-core XLPE / EPR cable; for three-core cable, the appropriate Raychem three-core terminations are the right product.
• Modular system: works alongside the wider Raychem RSTI screened separable family, including coupling connectors and T-connectors.

Compatibility: cables, systems, and interfaces

For the RSTI-5851, confirm:

• System voltage class: 22 / 24 kV.
• Current rating: 1250 A continuous; for lower-current installations, the 630 A RSTI variants may be a better fit.
• Cable construction: single-core screened polymeric (XLPE / EPR) MV cable.
• Conductor cross-section: within the connector's stated size range, choose the kit to match the cable being terminated.
• Bushing interface: Interface C per IEC EN 50181 on the equipment side.
• Lug compatibility: confirm the connector body is matched to the lug or compression fitting on the cable.

Specifications: what to confirm before you order

Target users and applications

• Utilities and DNO contractors connecting MV cable into transformers, switchgear, and ring main units on the 22 / 24 kV network
• Renewable site installers terminating collector cable into wind, solar, and BESS substations
• Industrial electrical contractors carrying out MV cable connection into plant transformers and primary switchgear
• Cable jointing teams replacing legacy fixed terminations with separable connectors for future maintainability

Typical applications include MV cable connection into transformer bushings, primary and secondary switchgear, ring main unit interfaces, and any installation where future disconnection or replacement of the cable is part of the asset management plan. The RSTI-5851 sits naturally alongside the wider Raychem screened separable connector range, including the higher-class 36 / 42 kV RSTI-6853 for higher-voltage networks and three-core breakouts for three-core cable terminations.

Powerpoint Engineering supplies the RSTI-5851 alongside Klauke crimping tools and lugs and the cable preparation kit needed to install them correctly first time.

FAQs

What is the difference between the RSTI-5851 and the RSTI-6853?

Both are Raychem screened separable connectors with 1250 A current rating and Interface C bushing format. The RSTI-5851 is rated for 22 / 24 kV systems; the RSTI-6853 is rated for 36 / 42 kV systems. Choose the connector to match the system voltage class of the cable and bushing.

Is the RSTI-5851 suitable for three-core cable?

The RSTI-5851 is a single-core connector. For three-core polymeric cable, the standard approach is a three-core breakout plus three RSTI connectors per cable end, one per phase. We can supply the matched breakout kit alongside the RSTI-5851s.

What is Interface C?

Interface C is the standardised MV bushing interface defined in IEC EN 50181, designed to accept screened separable connectors at higher voltage and current ratings. It is used widely on European MV switchgear and transformers above 24 kV class.

To match the right RSTI-5851 to your cable, bushing interface, and lug type, request a quote or speak to our team for compatibility advice.