ReliaSense power measurement sensors

Medium-voltage switchgear

Eaton’s ReliaSense power measurement sensors is a portfolio containing current and voltage sensors designed to enhance equipment performance, increase operational efficiency and improve safety. The flexibility provided by sensors over auxiliary transformers allows design engineers to easily adapt during the design phase, resulting in efficiency in design and accuracy in application. In addition, retrofitting existing equipment with ReliaSense is a simple way to update existing systems and remove potential failure modes from aged equipment.

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Overview Technical Resources Support

Voltage class

5-38 kV

CONTINUOUS CURRENT

1200 A - 4000 A

Webinar: Digital solutions for smarter electrical systems

Did you miss this webinar? Don't worry! You can still catch up on all the valuable information and topics discussed.

Understand the differences in auxiliary transformers and sensors.
Review case studies and examples of power measurement sensors.
Understand how NFPA 70B, now the standard for electrical maintenance plans, impacts clients and learn ways to help them simplify and reduce those impacts.
Gain knowledge on how environmental factors affect switchgear health.

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Core features

Voltage and current sensors available to replace traditional current and voltage transformers.
Voltage sensors effectively mitigate the risk of voltage (potential) transformer failures caused by ferroresonance, insulation failures, switching transients.
Current sensors remove the risk of shock hazard due to an open circuit on current transformers.
ReliaSense sensors can provide high accuracy over a wider frequency range, making them suitable for power quality monitoring and transient detection.
Unlike current transformers and voltage transformers, these sensors can withstand system events without saturating or blowing fuses.
Sensors are a lightweight and small footprint solution that are easily retrofittable and have simple connections to the protective relaying/metering devices.
Current sensors do not require ratio definition, making it ideal for short-cycled projects where pre-defining ratio definition can be challenging.

Benefits of ReliaSense power measurement sensors

Safety

Removes shock hazards associated with open current transformers and eliminates potential of arc-flash events due to VT failures.

Reliability

Current sensors do not saturate and have consistent accuracy over a broad range of amperage levels. Voltage sensors have higher accuracy over a wider frequency range.

Flexibility

Current sensors do not require pre-defined ratios. Excellent solution when systems load profiles are changing. Smaller size and weight (98% smaller), making it ideal when retrofitting existing equipment.

Specifications

CURRENT SENSORS

IEC STANDARD	61869-10, IEC 61869-1, UL, CSA
ACCURACY CLASS	0.5% per IEEE C57.13 class 0.6
CONNECTION TYPE	LEA port (RJ45 connector)
CURRENT RANGE	5 A-50,000 A
FREQUENCY RANGE	45 Hz – 65 Hz
3RD PARTY CERTIFICATIONS	UL, CSA

VOLTAGE SENSORS

ACCURACY	1%
OUTPUT	100 VAC / 0.45 VA L-L, 0.78 VA L-G
FREQUENCY	50/60 Hz
AMPLIFIER CONTROL POWER	24-240 VAC/DC
WIRED AD WYE CONFIGURATION

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Brochures

ReliaSense power measurement sensors - PA022020EN

Digital solutions that offer flexibility during the design phase to better support short-cycled projects.

(PDF 501 KB , 10/10/2025) Updated

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