ABB RXEDK 2H 1MRK000841-KA

Description

Detailed parameter table

ABB RXEDK 2H 1MRK000841-KA

Product introduction

The RXEDK 2H 1MRK000841-KA is a robust medium-voltage surge arrester from ABB, engineered to protect 12 kV electrical distribution systems against transient overvoltages caused by lightning strikes, switching operations, and system faults. As a critical component in power network protection, it limits surge voltages to safe levels, safeguarding transformers, switchgear, and other expensive equipment from damage and ensuring uninterrupted power supply.

With a nominal discharge current of 20 kA and a maximum discharge current of 40 kA, RXEDK 2H 1MRK000841-KA provides reliable protection for medium-voltage networks in industrial facilities, commercial complexes, and utility distribution systems. Its silicone rubber housing offers excellent resistance to UV radiation, ozone, and temperature extremes, making it suitable for both indoor and outdoor installations. Whether deployed as a standalone arrester or in conjunction with RXPPK 2H 1MRK001615-AA for layered protection, RXEDK 2H 1MRK000841-KA delivers consistent performance, minimizing downtime and reducing maintenance costs in power distribution systems.

Core advantages and technical highlights

Superior surge handling capability

RXEDK 2H 1MRK000841-KA can safely discharge up to 40 kA of surge current, making it ideal for areas prone to frequent lightning activity. In a suburban utility distribution network, this capability ensures that a direct lightning strike on an overhead line doesn’t damage the substation transformer, as the arrester clamps the overvoltage to ≤35 kV—well below the transformer’s insulation withstand level.

Durable silicone housing

The arrester’s silicone rubber housing resists aging, tracking, and erosion, even in polluted or coastal environments. In a chemical plant located near the coast, RXEDK 2H 1MRK000841-KA withstands salt spray and corrosive fumes, maintaining its protective properties for over 20 years—doubling the service life of traditional porcelain-housed arresters.

Low residual voltage

With a voltage protection level of ≤35 kV at 10 kA, RXEDK 2H 1MRK000841-KA minimizes the energy transferred to protected equipment. In a data center’s 12 kV backup power system, this low residual voltage ensures that sensitive UPS components aren’t damaged during switching surges, preventing costly data loss and downtime.

Typical application scenarios

In a manufacturing facility’s 12 kV distribution system, RXEDK 2H 1MRK000841-KA is installed at key protection points:

• Mounted on the primary side of the main transformer, protecting it from incoming line surges.
• Installed at the feeder outlets to safeguard motors, drives, and other critical loads.
• Paired with RXPPK 2H 1MRK001615-AAarresters on secondary 24 kV circuits for comprehensive system protection.

During a thunderstorm, the arrester diverts a 30 kA lightning surge to ground, clamping the voltage to 32 kV and preventing damage to a 1000 HP motor connected to the feeder—avoiding an estimated $50,000 in repair costs and 48 hours of downtime.

In a commercial high-rise building’s electrical system, RXEDK 2H 1MRK000841-KA protects the 12 kV switchgear and transformers:

• Installed between the utility incoming line and the main switchgear to block external surges.
• Placed on the transformer secondary side to suppress switching surges from the building’s internal distribution network.
• Its compact design allows installation in the building’s limited substation space, while its IP66 rating ensures reliability in the damp environment of the basement substation.

The arrester’s fast response time (≤25 ns) ensures that even fast-rising surges from elevator motor switching are suppressed, maintaining power quality for sensitive office equipment.

ABB RXEDK 2H 1MRK000841-KA

Related model recommendations

• RXEDK 1H 1MRK000840-KA: 6 kV version of RXEDK 2H 1MRK000841-KAfor lower-voltage distribution systems.
• RXPPK 2H 1MRK001615-AA: 24 kV surge arrester that complements RXEDK 2H 1MRK000841-KAin mixed-voltage networks.
• OTL 12D: ABB 12 kV switchgear compatible with RXEDK 2H 1MRK000841-KAfor integrated protection.
• 1MRK000219-BA: Surge arrester monitoring unit that tracks RXEDK 2H 1MRK000841-KA’s performance and degradation.
• RXE 2H 1MRK000850-KA: Distribution arrester with higher discharge current capability for high-risk lightning zones.
• T2S 12: ABB 12 kV transformer designed to work with RXEDK 2H 1MRK000841-KAfor optimal protection.
• CR12: 12 kV current transformer that pairs with RXEDK 2H 1MRK000841-KAin metering and protection circuits.

Installation, commissioning and maintenance instructions

Installation preparation

Before installing RXEDK 2H 1MRK000841-KA, ensure the 12 kV system is de-energized and grounded. Verify that the mounting surface is flat and capable of supporting the arrester’s weight (approx. 2 kg). Mount the arrester using M10 bolts (torque to 25 Nm) with the flange facing downward to prevent water accumulation. Connect the high-voltage terminal to the phase conductor using appropriate connectors (rated for 12 kV and ≥630 A). Connect the ground terminal to a low-impedance ground grid (≤5 Ω) using 70 mm² copper cable. Ensure the arrester is installed vertically with a minimum clearance of 300 mm from other live parts.

Maintenance suggestions

Inspect RXEDK 2H 1MRK000841-KA annually for physical damage, including cracks in the housing, loose connections, or signs of tracking. Clean the housing with a soft cloth and mild detergent if contaminated. Measure the arrester’s leakage current every 3 years using a specialized tester—values exceeding 1 mA at 1.05×Uc indicate degradation and require replacement. Record surge counter readings (if equipped) to track the number of significant events. Replace RXEDK 2H 1MRK000841-KA if the housing is damaged, leakage current exceeds limits, or after a surge exceeding 40 kA. Use only ABB-approved spares to maintain protection levels.

Service and guarantee commitment

The RXEDK 2H 1MRK000841-KA is backed by a 10-year warranty, covering defects in materials and workmanship under normal operating conditions. ABB’s power systems engineers provide on-site installation verification, including surge protection coordination studies with other devices like RXPPK 2H 1MRK001615-AA.

Customers receive access to detailed application guides and maintenance checklists specific to RXEDK 2H 1MRK000841-KA. ABB offers training programs on surge arrester selection and maintenance, ensuring proper installation and operation. With global distribution centers, replacement arresters are available for rapid delivery, minimizing unprotected downtime in critical power systems. Trust RXEDK 2H 1MRK000841-KA to deliver reliable surge protection, backed by ABB’s expertise in power distribution systems.