ABB RXEDK 2H 1MRK000841-RA

Description

Detailed parameter table

ABB RXEDK 2H 1MRK000841-RA

Product introduction

The RXEDK 2H 1MRK000841-RA is a medium-voltage surge arrester from ABB, designed as a variant of the RXEDK 2H 1MRK000841-KA to protect 12 kV electrical distribution systems against transient overvoltages. Like its counterpart, it serves as a critical protective component, diverting surge currents from lightning strikes, switching operations, and system faults to ground, thereby safeguarding transformers, switchgear, and other key equipment.

While sharing core surge handling capabilities with the RXEDK 2H 1MRK000841-KA, the RXEDK 2H 1MRK000841-RA features a porcelain housing, making it suitable for applications where mechanical robustness and traditional material preferences are prioritized. It maintains compatibility with 12 kV distribution networks and can be integrated with RXPPK 2H 1MRK001615-AA arresters for layered protection, ensuring reliable performance in industrial, commercial, and utility environments.

Core advantages and technical highlights

Robust porcelain housing

The RXEDK 2H 1MRK000841-RA’s porcelain housing offers exceptional mechanical strength, resisting impact and vibration in harsh industrial settings. In a mining operation’s 12 kV distribution system, this durability ensures the arrester remains intact despite heavy machinery vibrations and occasional debris impact, outperforming housings prone to cracking under such stress.

Proven surge protection

With a maximum discharge current of 40 kA and nominal current of 20 kA, it matches the surge handling capability of the RXEDK 2H 1MRK000841-KA. In a rural utility network, it effectively clamps lightning-induced overvoltages to ≤38 kV, protecting distribution transformers from insulation breakdown and ensuring uninterrupted power supply to remote communities.

Temperature resilience

Operating within -40°C to +70°C, the arrester adapts to extreme climate conditions. In a desert utility substation, it withstands scorching daytime temperatures and frigid nights, maintaining consistent protection without performance degradation—a critical trait for reliable operation in unconditioned outdoor enclosures.

ABB RXEDK 2H 1MRK000841-RA

Key differences from RXEDK 2H 1MRK000841-KA

Housing material

The most notable difference is the housing: RXEDK 2H 1MRK000841-RA uses porcelain, while the RXEDK 2H 1MRK000841-KA features silicone rubber. Porcelain offers higher mechanical strength but is less resistant to UV-induced aging compared to silicone rubber.

Voltage protection level

The RXEDK 2H 1MRK000841-RA has a slightly higher voltage protection level (≤38 kV) versus the RXEDK 2H 1MRK000841-KA (≤35 kV), which should be considered when protecting equipment with strict insulation withstand limits.

Operating temperature range

It has a narrower upper operating temperature limit (+70°C) compared to the RXEDK 2H 1MRK000841-KA (+80°C), making the latter more suitable for extremely high-temperature environments.

Protection class

With an IP65 rating, the RXEDK 2H 1MRK000841-RA offers slightly lower dust and water ingress protection than the IP66-rated RXEDK 2H 1MRK000841-KA, requiring more careful installation in highly humid or dusty areas.

Typical application scenarios

In a heavy industry plant with high mechanical stress, such as a steel mill:

Installed on 12 kV feeder lines near rolling mills, where porcelain housing resists vibration-induced damage.

Protects large motors and transformers from switching surges generated by frequent equipment startups.

Paired with RXPPK 2H 1MRK001615-AA on secondary circuits to form a complete protection system.

In regions with moderate climate and traditional infrastructure preferences:

Deployed in utility substations where porcelain arresters are the standard, ensuring compatibility with existing maintenance practices.

Protects 12 kV switchgear from lightning surges, with porcelain housing standing up to occasional rain and wind-driven debris.

Related model recommendations

RXEDK 1H 1MRK000840-RA: 6 kV variant of RXEDK 2H 1MRK000841-RA for lower-voltage systems.

RXPPK 2H 1MRK001615-AA: 24 kV arrester for mixed-voltage network protection, compatible with RXEDK 2H 1MRK000841-RA.

OTL 12D: 12 kV switchgear that integrates seamlessly with RXEDK 2H 1MRK000841-RA.

1MRK000219-BA: Monitoring unit to track performance metrics of RXEDK 2H 1MRK000841-RA.

T2S 12: 12 kV transformer optimized for use with RXEDK 2H 1MRK000841-RA for enhanced protection.

Installation, commissioning and maintenance instructions

Installation preparation

Similar to the RXEDK 2H 1MRK000841-KA, de-energize and ground the 12 kV system before installation. Mount using M10 bolts (torque to 25 Nm) on a flat surface, ensuring vertical orientation. Connect the high-voltage terminal to the phase conductor with 12 kV-rated connectors and the ground terminal to a ≤5 Ω ground grid using 70 mm² copper cable. Maintain 300 mm clearance from live parts. Note that porcelain housing is more brittle than silicone, so handle with care to avoid cracks.

Maintenance suggestions

Inspect annually for cracks in the porcelain housing, loose connections, or contamination. Clean with a soft brush and mild detergent to remove dirt, which can cause tracking. Measure leakage current every 3 years—replace if exceeding 1 mA at 1.05×Uc. Unlike silicone, porcelain may require more frequent cleaning in polluted areas to maintain performance. Replace after a surge exceeding 40 kA or if housing is damaged.

Service and guarantee commitment

The RXEDK 2H 1MRK000841-RA comes with a 8-year warranty, covering material and workmanship defects. ABB’s technical team provides installation support, including coordination studies with other protection devices. Customers receive maintenance guides tailored to porcelain arrester care, and replacement units are available globally for quick delivery, minimizing unprotected downtime.