ERLPhase Power Technologies is an ISO 9001:2015 manufacturer of digital protection relays and power system recorders in Winnipeg, Canada. Our protection relays and disturbance fault recorders deliver high quality and reliable protection and monitoring of electrical power systems. Our company-wide focus on solving our customer’s problems, has led to our line of innovative, easy to configure and use protection and recording products which find widespread application in the power industry. The S-PRO sub-harmonic protection relay protects various power system equipment from uncontrollable sub-synchronous oscillation conditions. TESLA 4000 is an easy-to-use and cost effective, state-of-the-art, multi-time frame (simultaneous) digital fault recorder. Its integrated Phasor Measurement Unit (PMU) functionality streams synchrophasor data for wide area monitoring. Enabled with IEC 61850 protocol, TESLA has advanced communication capabilities that, together with its powerful recording features, provide the most versatile and complete monitoring of power system health.