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Main Isolator Switches for Distribution Board Isolation | 40A-100A | IEC 60947-3
Reliable and trusted main disconnect switch
KRIPAL manufactures main isolator switches in the UKX series for incoming supply isolation in residential, commercial and industrial distribution boards. These modular-operated load-break switches provide a visible means of disconnecting the electrical installation from the supply, with rated operational currents from 40A to 100A at 240/415V AC and a utilization category of AC-22 per IEC 60947-3 (EN60947-3). The UKX features double-functioned terminals and a clear contact condition indicator per pole, achieving reliable isolation according to DIN VDE 0106. The toggle handle provides a clear ON-OFF position indication with a padlockable OFF position (hole diameter up to 6mm) for lockout-tagout compliance. The compact DIN-rail format (ranging from 17.8mm for 1P to 71.2mm for 4P+N) fits within standard consumer units and distribution boards, and the terminals accept cable cross-sections up to 50 sq mm. With a short-circuit durability reaching 25kA (after 100A backup fuse), KRIPAL UKX main isolator switches are the standard incoming device for distribution boards where required.
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UKX-100 AC22A 230V Isolating Switch 100A 4 Pole
The UKX-40 AC22A 2Pole 230V AC Isolating Switch is a two-pole isolator for 230V AC circuits, compliant with IEC 60947-3 and GB/T 14048.3.
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UKX-100 AC22A 230V Isolating Switch 100A 1 Pole
The UKX-40 AC22A 2Pole 230V AC Isolating Switch is a two-pole isolator for 230V AC circuits, compliant with IEC 60947-3 and GB/T 14048.3.
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UKX-40 AC22A 230V Isolating Switch 40A 3 Pole
The UKX-40 AC22A 2Pole 230V AC Isolating Switch is a two-pole isolator for 230V AC circuits, compliant with IEC 60947-3 and GB/T 14048.3.
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UKX-40 AC22A 230V Isolating Switch 40A 2 Pole
The UKX-40 AC22A 2Pole 230V AC Isolating Switch is a two-pole isolator for 230V AC circuits, compliant with IEC 60947-3 and GB/T 14048.3.
Ask a QuoteMain Isolator Switch: Safe Distribution Board Isolation
A main isolator switch is the single disconnection point for an entire electrical installation, located at the origin of the installation (typically in the consumer unit or distribution board). Its function is to provide a guaranteed air-gap isolation between the supply and the installation for safe maintenance, emergency disconnection and firefighter isolation. Unlike a circuit breaker, an isolator switch does not provide automatic overcurrent protection; it is a manually operated device designed to be switched under load (rated making and breaking capacity of 1.2 In., 1.1 Ue) or used as an off-load isolator after the upstream protective device has disconnected the supply. IEC 60364 requires a main linked switch or linked circuit breaker at the origin of every installation, and the UKX series provides this function in a compact modular format.
UKX Main Isolator Switch Series Technical Specifications
Current Rating and Load-Break Capability
The UKX isolator current rating is selected to match installation demands, offering standard ratings of 40A, 63A, 80A, and 100A for residential and commercial circuits. The AC-22 utilization category ensures the switch handles 1.2 times rated current and 1.1 times rated voltage under standard operational parameters per IEC 60947-3. Furthermore, it provides a short-circuit durability of 25kA when paired with a 100A backup fuse for reliable circuit protection.
Isolation Gap and Safety Verification
The UKX series guarantees reliable circuit disconnection supported by a clear contact condition indicator per pole, complying with DIN VDE 0106 isolation standards. The toggle handle displays distinct ON-OFF positions and includes a padlockable OFF feature with a shackle hole diameter up to 6mm for safety compliance. Its robust structural build and double-functioned terminals ensure secure performance during daily operations.
Pole Configuration and Supply Type
The UKX is manufactured in 1P, 2P, 3P and 4P+N options to safely accommodate 240/415V AC power supplies at 50/60Hz frequencies. Single-phase circuits utilize 1P or 2P configurations, while three-phase networks use 3P or 4P+N arrangements. Each multi-pole unit features a synchronized mechanical link design, maintaining modular widths from 17.8mm for 1P up to 71.2mm for 4P+N.
Terminal Capacity and Compact Design
The UKX integrates double-functioned terminals engineered for high-integrity connections, supporting cable cross-sections up to 50 sq mm. Its compact DIN-rail format seamlessly integrates into standard consumer units, achieving an IP40 case protection grade post-installation. KRIPAL UKX switches serve as trusted incoming supply disconnects across broad industrial, commercial, and civil electrical applications.
Specify Main Isolators for Your Distribution Board
- Isolator Sizing: Provide your installation maximum demand and supply type, and we recommend the correct UKX current rating and pole configuration.
- OEM Board Integration: Source UKX isolators pre-assembled in your distribution board with connecting busbars and associated components installed.
- Bulk Supply: Order UKX isolators in bulk packs for your panel building production line, ensuring seamless project execution.
Distribution Board Main Isolation for Residential and Commercial
KRIPAL UKX main isolator switches provide the single-point supply disconnection for electrical installations in residential, commercial and industrial buildings. As the device that an electrician, maintenance technician or firefighter operates to make the installation safe before working on it, the isolator’s reliability, clear contact condition indicator and padlock facility are directly linked to personnel safety.
Domestic Consumer Unit Main Switch
A residential consumer unit uses a UKX 100A 2P main isolator switch as the first device after the meter tails, providing the single point of isolation for the household installation. The electrician isolates the supply by switching the main isolator to OFF and padlocking it (shackle hole diameter up to 6mm) before performing maintenance. The clear contact condition indicator per pole provides a high level of safety assurance in compliance with DIN VDE 0106. The 100A rating covers standard residential maximum demand requirements.
Commercial Distribution Board Incoming Isolator
A commercial distribution board uses a UKX 100A 4P+N main isolator to disconnect the supply to the premises. The isolator is operated in an emergency to de-energize electrical equipment per IEC 947.3 (EN60947.3). The toggle handle position allows verification at a glance that the supply is isolated, and the padlock facility prevents unauthorized re-energization during maintenance.
Renewable Energy Inverter AC Isolator
Grid-tied solar PV inverters require a dedicated AC isolator switch adjacent to the inverter for maintenance or emergency disconnection. A UKX 40A or 63A isolator provides this function under utilization category AC-22, with the toggle handle clearly indicating the ON-OFF status. The isolator is wired between the inverter AC output and the distribution board, providing reliable local isolation.
Temporary Construction Site Supply Isolator
A temporary construction site supply uses a UKX 100A 4P+N isolator as the main disconnection point for the distribution system. The isolator provides a short-circuit durability reaching 25kA (after a 100A backup fuse) to ensure protection at the origin of the installation. In the event of an emergency, the site manager can isolate the supply by switching the isolator to OFF and padlocking it.
Swimming Pool Plant Room Supply Isolator
Swimming pool plant rooms with pump motors and equipment use a UKX 63A 4P+N isolator as the local supply disconnection point. The isolator features double-functioned terminals and an IP40 case protection grade (after installation) to ensure secure connections. Its operation allows the operator to isolate plant room equipment safely before entering for maintenance.
Specify Isolator Switches for Your Project
- Application Review: Tell us about your installation and we recommend the correct UKX model with the right current rating and pole configuration.
- OEM Supply: Source UKX isolators pre-installed in your distribution boards with busbar connections and custom labeling.
- Bulk Packs: Order isolator bulk packs for electrical wholesaler distribution.
KRIPAL Main Isolator Manufacturing: Visible Safety
KRIPAL UKX main isolator switches are manufactured on a modern assembly line where the housing, double-functioned terminals, and toggle handle are produced, assembled, and tested under strict quality management for global distribution board and switchgear isolation applications.
Terminal and Mechanism Assembly
The UKX isolator uses robust internal components and double-functioned terminals designed for secure wire connection up to 50 sq mm. The toggle handle provides a clear ON-OFF position indication supported by a clear contact condition indicator per pole, satisfying isolation requirements per DIN VDE 0106.
Padlockable Handle Integration
Handle mechanisms incorporate a padlock facility in the OFF position (lockable with a shackle hole diameter up to 6mm) for lockout-tagout compliance during maintenance operations. The reliable toggle mechanism ensures dependable manual operation across industrial, commercial, and civil installations.
Dielectric Withstand Testing
Every UKX main isolator switch undergoes rigorous quality checks to ensure reliable performance. The switches feature an IP40 case protection grade (after installation) and comply with standard operational parameters to prevent insulation breakdown.
AC-22 Utilization Category Verification
Sample units from each production batch are evaluated for making and breaking capacity at the AC-22 utilization category (tested at 1.2 times rated current and 1.1 times rated voltage) per IEC 947.3 (EN60947.3) to verify switching performance.
Distributor Stock Holding Programs for Main Isolators
KRIPAL supports distributor inventory programs with agreed stock levels for standard UKX main isolator switch models from 40A to 100A (across 1P, 2P, 3P, and 4P+N configurations). Shipments are planned based on demand data to maintain stable supply.
Private Label and OEM Branding for Main Isolators
Laser-marked part numbers aligned with your catalog, OEM-branded packaging, and customized instruction sheets are available for the UKX series. Unbranded supply is provided upon request for private label production.
Multi-Region Certification and Compliance Support
CE, and IEC 947.3 (EN60947.3) compliance documentation is provided according to target export markets. Technical documentation files for the UKX range are maintained and updated in line with regulatory requirements.
Direct Technical Access to KRIPAL Production Engineers
Your technical team communicates directly with the engineers who designed and tested your UKX main isolator switches. Application questions including category selection receive prompt answers during business hours.
Frequently Asked Questions
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