The Seba KMT HV Tester 25 kV is a portable high voltage generator with a variable negative DC output voltage of 0 to 25 kV, designed for DC and insulation testing of cables, joints, electrical installations, and other equipment. It is robust, lightweight, and compact at approximately 13.5 kg, making it straightforward to carry to site and easy to handle in confined spaces. Due to its small size and internal battery, the HV Tester 25 kV is particularly suited to field test conditions and remote locations where no external power supply is available.
Manufactured by SebaKMT (part of the Megger Group), the unit is available in standard analogue and digital metering variants, as well as a version with an external emergency switch for additional operator protection.
We are authorised SebaKMT distributors in Ireland. Call our technical team on 057 866 2162 for pricing and availability, or send us an enquiry.
Technical specifications
| Specification | Value |
| DC output voltage | 0 to 25 kV, negative polarity |
| Rated output current | 1.5 mA at maximum output voltage |
| Voltage measuring range | 0 to 30 kV |
| Current measuring ranges | 0 to 0.2 mA and 0 to 2 mA |
| Precision | ±2.5 % |
| Power supply (selectable) | Mains 115 V / 230 V, 50/60 Hz; internal rechargeable battery; external battery 11 to 15 V DC |
| Battery operating time | Approximately 45 minutes at full load |
| Maximum discharge energy | 3,000 J |
| Operating temperature | -25 °C to +55 °C |
| Storage temperature | -40 °C to +70 °C |
| Dimensions (W x H x D) | 467 x 168 x 284 mm |
| Weight | Approximately 13.5 kg (including batteries) |
Download the Seba KMT HV Tester 25 kV datasheet for full specifications.
Key features and safety
The HV Tester 25 kV includes several safety features that matter in practice. Capacitive loads, such as shielded cables, are safely and automatically discharged in the event of a breakdown or at the end of testing via the internal discharge facility. A grounding safety circuit provides continuous operator protection, and the HV-on with 0 kV interlock helps prevent accidental activation of the high-voltage output. The output is both short-circuit and open-circuit proof.
A built-in timer (adjustable from 1 to 30 minutes) allows timed test sequences, and the stabilised adjustable output voltage with voltage measurement directly at the high-voltage output gives confidence in reading accuracy. The built-in rechargeable battery enables mains-independent operation, while an external 11 to 15 V DC battery can be connected for extended testing in the field. Easy operation, compact design, and a weight of just 13.5 kg make it a practical choice for engineers who need portable HV test equipment across multiple sites.
Applications
The HV Tester 25 kV is used for testing newly installed cables and splices before they are taken into service, DC and insulation testing of cables, joints, and electrical installations, and preventive testing after maintenance or repair work on cables and other HV plant. It is also suitable for general electrical installation testing and re-commissioning checks. The combination of mains, internal battery, and external battery power supply options means it can operate in substations, cable chambers, and remote locations where no mains supply is available.
What is included
The product ships with the HV Tester including rechargeable battery and leather carrying case, a mains lead, a battery lead for an external DC battery (approximately 3 m), two ground leads (approximately 3 m each, one for station ground and one for protective ground), a high-voltage lead with terminal (approximately 3 m), and an operating manual.
A variant with an external emergency switch is also available. Contact us to discuss which configuration suits your requirements.
Frequently asked questions
Can the HV Tester 25 kV operate without mains power?
Yes. The built-in rechargeable battery provides approximately 45 minutes of operation at full load. An external 11 to 15 V DC battery can also be connected for extended use, making this HV tester well suited to field conditions where no external power supply is available.
What safety features does the HV Tester 25 kV have?
The unit features an integrated discharge facility (capacitive loads are safely and automatically discharged at the end of testing or in the event of a breakdown), a grounding safety circuit, an HV-on with 0 kV interlock to prevent accidental activation, and short-circuit and open-circuit proof output.
What is the difference between the HV Tester 25 kV and the Seba KMT HV Test Set 50/80/110 kV?
The HV Tester 25 kV is a single-unit portable DC high voltage generator for cable insulation testing up to 25 kV, weighing approximately 13.5 kg with built-in battery. The HV Test Set series (available in 50, 80, and 110 kV versions) are higher-voltage modular systems consisting of separate operation and HV units, designed for higher-voltage cable testing. They offer greater output current and voltage but are heavier (30+ kg total). We supply both product ranges. Call us on 057 866 2162 if you need help deciding which is right for your application.
Not exactly what you are looking for? Contact us at with your exact requirements, we?re happy to help.
Seba KMT HV Tester 25 kV - Portable HV Tester Datasheet
For additional technical details about the Seba KMT HV Tester 25 kV - Portable HV Tester please refer to the product datasheet.
