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KPM KFA 310/310+

High-power. High-precision. Multi-functional. The world's smallest protection relay tester — iPad-sized, battery-powered, and built for the field.

World's Smallest Protection Relay Tester

The KPM KFA310 features a compact interior similar in size to an iPad, powered by batteries. This secondary injection test set weighs only 3.7 kg and offers 4×300V and 3×20A* outputs. Its maximum current can reach 50A*, and the output power reaches 130VA. A 7.0-inch LED touch screen provides intuitive control in a truly portable form factor.

Key Specifications at a Glance

3.7kg

Ultra-Light Weight

Easy to carry, iPad-sized design

50A*

Max Current Output

High-current version (KFA310+)

130VA

Output Power

Continuous high-precision output

7.0in

LED Touch Screen

Intuitive handheld interface

The KFA310 continuously outputs 3×10A conditions with high precision, making it suitable as a standard source for field testing.

Core Testing Functions

AC/DC & Ramping

Full AC and DC testing with ramping capability for protection relay verification.

State Sequence

Multi-state testing sequences for complex relay logic validation.

Harmonic & Distance

Harmonic injection and distance protection testing in one device.

Overcurrent & Oscillate

Overcurrent testing plus customizable superimposed oscillation waveform simulation.

Advanced Testing Capabilities

Frequency Test

Supports df/dt and ROCOF testing for frequency-based protection schemes.

3-Phase Standard Power Source

Functions as a reliable 3-phase standard power source for field applications.

Energy Meter Calibration

Precision output enables direct energy meter calibration in the field.

Double-Device Synchronous Test

Up to 6 current channels for differential testing across two devices.

8-Channel Low-Level Outputs

Delivers 0–8Vrms low-level outputs across 8 channels.

Innovative "Plug and Play" Design

Simple Internal Structure

Extremely simple internal design ensures high quality and reliability. Beginners can achieve independent installation without specialized training.

Module Replacement Only

For after-sales maintenance, only module replacement is required. No accuracy calibration needed after replacement — once assembled, it's ready to use immediately.

After-Sales Service Advantages

Easy Installation

Simple structure allows even beginners to perform independent installation and module replacement.

Reduced Costs

Modular design significantly reduces after-sales service costs compared to traditional testers.

20-Day Goal

Complete after-sales service within 20 working days — fast, efficient, and reliable.

Built for Reliability & Longevity

3-Year Warranty

Innovative technology and module design ensure a higher level of product quality, backed by a full 3-year warranty commitment.

15-Year Service Life

The KFA310 is engineered to meet a quality objective of 15 years of product service life — a testament to its robust design.

KFA310 vs. KFA310+

Both models share the same compact, iPad-sized design and full feature set. The KFA310+ delivers up to 50A maximum current output for high-current testing scenarios.

Ready to Test Smarter?

The KPM KFA310/310+ combines portability, precision, and plug-and-play simplicity in the world's smallest protection relay tester. Designed for field engineers who demand reliability without compromise.

Compact & Portable

3.7 kg, iPad-sized, battery-powered

High Precision Output

Up to 50A*, 130VA, usable as a standard source

Plug & Play Service

Module replacement only, 20-day after-sales goal