Schneider Electric RM22TA33 network monitoring for phase sequence, failure, asymmetry 380-480 V AC 2W content_copy

The Schneider Electric RM22TA33 is a 3-phase control relay from the Harmony control relay series, specifically designed for monitoring three-phase power networks in the voltage range of 380 to 480 V AC. It is used for continuous monitoring of power quality and detects critical disturbances such as phase sequence, phase failure, and phase asymmetry. Detection occurs via a measurement cycle of up to 150 ms, measured as true RMS value, ensuring reliable detection of rapidly changing voltage conditions. The asymmetry threshold is adjustable within a range of 5 to 15 % of the selected nominal voltage, with an adjustment accuracy of ±10 % of the range. The voltage detection threshold is below 100 V AC, ensuring safe response to voltage dips. Measurement accuracy is specified as less than 1 % over the entire range under voltage fluctuations and less than 0.05 %/°C under temperature fluctuations, enabling high reliability under varying operating conditions.

Applications

The relay is designed for industrial applications where power quality is critical for the safe operation of machines and systems. It is used in production plants, pump stations, air conditioning systems, and other installations that rely on stable three-phase power supply. Monitoring of phase sequence prevents incorrect motor operation, while detection of phase failure and asymmetry protects electrical equipment from damage. The integrated time delay function, adjustable from 0.1 to 30 seconds with an accuracy of ±10 % of the full scale value, allows differentiated response to short-term disturbances, avoiding unnecessary shutdowns.

Functions and Equipment in Detail

For signaling disturbances, two relay changeover contacts are available, each rated up to 8 A. The switching capacity is 2000 VA with a maximum switching voltage of 250 V AC. The contacts are made from cadmium-free material, complying with requirements for environmentally compatible electrical devices. The electrical life is 100,000 switching cycles, and the mechanical life is 10,000,000 cycles, ensuring high operational reliability over a long period. Adjustments for the asymmetry threshold and shutdown delay are made via controls on the front side, protected under a transparent cover to prevent unintended changes. An illuminated scale pointer allows clear visibility of the settings even from a distance.

Technology Explained Simply

The relay is powered from the measurement circuit, with the rated voltage being battery-operated and ranging from 304 to 576 V AC. The frequency of the supply voltage is 50 to 60 Hz ±10 %. Power consumption is 15 VA at 480 V AC and 60 Hz. The reset time is 1500 ms at maximum voltage, indicating the time required to return to normal operation after a disturbance. Connections are made via screw terminals designed for rigid conductors from 0.5 to 2.5 mm² (AWG 20–14) and flexible conductors from 0.2 to 1.5 mm² (AWG 24–16). The torque specification is between 0.6 and 1 Nm to ensure a secure connection.

Compatibility and Accessories

The device is designed for mounting on a 35 mm DIN rail, enabling easy integration into existing enclosures. It is equipped with a front-mounted diagnostic switch that allows deactivation of the output relays for testing the entire system. Closing the transparent cover automatically resets the diagnostic switch. Status indication is provided by three LEDs: a yellow LED indicates relay status (ON), a green LED indicates power status (ON). The protection rating is IP20 at terminals, IP20 at the enclosure, and IP20 at the front plate, providing protection against contact and limited protection against dust and splashing water. The operating ambient temperature ranges from -20 to 50 °C at 60 Hz and -20 to 60 °C at 50 Hz. Relative humidity is 93 to 97 % at 25 to 55 °C. The device complies with IEC 60255-1 and is certified with CE, UL, CSA, RCM, EAC, CCC, and GL. The overvoltage category III and pollution degree 3 meet requirements for industrial applications. The dielectric test voltage is 2.5 kV/1 min AC 50 Hz, and the insulation resistance is >100 MΩ at 500 V DC. Mounting is on a 35 mm DIN rail; width is 22.5 mm, height 90 mm, and depth 73 mm. The product weight is 0.095 kg.

Mounting and Installation

Mounting is on a standard 35 mm DIN rail, commonly found in enclosures and distributions. The terminals are designed for various conductor cross-sections, with torque specifications between 0.6 and 1 Nm. The screw terminals ensure a secure and durable connection. The front plate is fitted with a transparent cover that protects the controls while allowing visibility of the settings. The LED indicators on the front enable quick visual inspection of the operating status.

Operational Advantages

The RM22TA33 offers high reliability through precise measurements and long service life. Adjustable parameters allow individual adaptation to specific system requirements. The integrated diagnostic function simplifies maintenance and troubleshooting. Clear status indication via LEDs and visible adjustment of potentiometers improve usability. Mounting on the DIN rail and compact form factor of 22.5 mm width enable flexible integration into existing control systems. Certifications and compliance with standards ensure use in various markets and industries.

Complementary
[Us] rated supply voltage	self-powered
Supply voltage limits	304…576 V AC
Supply frequency	50...60 Hz +/- 10 %
Power consumption in VA	15 VA at 480 V AC 60 Hz
Measurement range	380...480 V voltage AC
Voltage detection threshold	< 100 V AC
Maximum measuring cycle	150 ms measurement cycle as true rms value
Adjustment of asymmetry threshold	5...15 % of Un selected
Setting accuracy of the switching threshold	+/- 10 % of the full scale
Repeat accuracy	+/- 0.5 % for input and measurement circuit; +/- 3 % for time delay
Measurement error	< 1 % over the whole range with voltage variation; < 0.05 %/°C with temperature variation
Time delay type	Adjustable 0.1...30 s, +/- 10 % of the full scale value Tt- time delay upon fault
Setting accuracy of time delay	10 %
Reset time	1500 ms at maximum voltage
Output contacts	2 C/O
nominal output current	8 A
Maximum switching voltage	250 V AC
Switching capacity in VA	2000 VA
Minimum switching current	10 mA at 5 V DC
Maximum switching current	8 A AC
Electrical durability	100000 cycles
Mechanical durability	10000000 cycles
Contacts material	Cadmium free
Contractual warranty
Warranty (in months)	18
Environment
Standards	IEC 60255-1
Product certifications	GL; EAC; CCC; CE; CSA; UL; RCM
Ambient air temperature for storage	-40…70 °C; -40…70 °C
Ambient air temperature for operation	-20…50 °C at 60 Hz; -20…60 °C at 50 Hz AC/DC
Relative humidity	93…97 % at 25…55 °C conforming to IEC 60068-2-30
Vibration resistance	0.075 mm (f= 10…58.1 Hz) not in operation conforming to IEC 60068-2-6; 1 gn (f= 10…58.1 Hz) not in operation conforming to IEC 60068-2-6; 0.035 mm (f= 58.1…150 Hz) in operation conforming to IEC 60068-2-6; 0.5 gn (f= 58.1…150 Hz) in operation conforming to IEC 60068-2-6
Shock resistance	15 gn (duration = 11 ms) for not in operation conforming to IEC 60068-2-27; 5 gn (duration = 11 ms) for in operation conforming to IEC 60068-2-27
IP degree of protection	IP20 (terminals) conforming to IEC 60529; IP40 (housing) conforming to IEC 60529; IP50 (front panel) conforming to IEC 60529
Pollution degree	3 conforming to IEC 60664-1; 3 conforming to UL 508
Overvoltage category	III conforming to IEC 60664-1; III conforming to UL 508
Dielectric test voltage	2.5 kV, 1 min AC 50 Hz conforming to IEC 60255-27
Insulation resistance	> 100 MOhm at 500 V DC conforming to IEC 60255-27
Connections - terminals	Screw terminals, 2 x 0.5...2 x 2.5 mm² (20 AWG...14 AWG) solid without cable end; Screw terminals, 2 x 0.2...2 x 1.5 mm² (24 AWG...16 AWG) flexible with cable end; Screw terminals, 1 x 0.5...1 x 3.3 mm² (20 AWG...12 AWG) solid without cable end; Screw terminals, 1 x 0.2...1 x 2.5 mm² (24 AWG...14 AWG) flexible with cable end
Tightening torque	0.6…1 N.m conforming to IEC 60947-1
Housing material	Polycarbonate
Local signalling	LED (yellow) relay ON; LED (green) power ON
Mounting support	35 mm DIN rail conforming to IEC 60715
Reliability data	MTTFd = 388.1 years; B10d = 350000
Height	90 mm; 88.9 mm
Width	22.5 mm; 22.9 mm
Depth	73 mm; 73.7 mm
Net weight	0.095 kg; 0.10 kg
Logistical informations
Country of origin	ID
Main
Range of product	Harmony Control Relays
Relay type	Control relay
Product or component type	3-phase control relay
Relay name	RM22TA
Relay monitored parameters	Phase sequence; Phase failure detection; Asymmetry
Control type	With test button
Contacts type and composition	2 C/O
Packing Units
Unit Type of Package 1	PCE
Number of Units in Package 1	1
Package 1 Height	2.6 cm
Package 1 Width	8.2 cm
Package 1 Length	9.5 cm
Package 1 Weight	104.0 g
Unit Type of Package 2	S02
Number of Units in Package 2	40
Package 2 Height	15 cm
Package 2 Width	30 cm
Package 2 Length	40 cm
Package 2 Weight	4.47 kg
Unit Type of Package 3	P06
Number of Units in Package 3	640
Package 3 Height	75.0 cm
Package 3 Width	60.0 cm
Package 3 Length	80.0 cm
Package 3 Weight	82.34 kg

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