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Superior Products and Solutions for the Power Industry Since 1975
Enhance your monitoring solutions with our full line of Digital Fault & Disturbance Recorders, Sequence of Events Recorders & DFR/DDR Modular Systems
Discover the right Control Accessory Solution with our extensive line of highly reliable Trip Indicator Relays Auxiliary Voltage Relays Trip Circuit Monitors and Battery Relay/Monitors

E-MAX Instruments, Incorporated is a leading provider of Digital Recorders, Relays, Power Supplies, and Control Accessories to the power industry. Founded in 1975, E-MAX is major source of innovative products that stress quality, reliability and performance. In 2026, we are proud to announce that E-MAX has joined the Electro Switch family. We remain dedicated to providing high-quality products, exceptional service and continuation of our complete product line.

Battery Monitor Relays, an efficient combination of over/under voltage sensors combined with positive and negative ground detection.

Available with a single relay alarm for any out-of-tolerance condition or with separate relays for voltage and fault conditions.

Products Solutions

Recording Systems
DC/DC Converters
Battery Relay/Monitors
Trip Circuit Monitors
Trip Indication Relays
Auxiliary Voltage Relays
Control Diodes
Analog Optical Isolators
Digital Optical Isolators

SURVEYOR

Complete Transient Recording / Analysis
Long Term Disturbance Recording
Continuous Waveform Recording
Power Quality Monitoring

Continuous Data Streaming Compliant
- NERC - PRC-00202
- IEEE C37.232

NERC Compliant
- IEEE - C37.118-2005
- IEC 61850

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