Schneider Electric RM17TA00 RM17-TA 3-phase relay

RM17TA00: RM17TA multifunction control relay in the Harmony range

The RM17TA00 is a Schneider Electric Harmony multifunction control relay from the RM17 family, built to supervise asymmetry, phase sequence and phase failure detection. It is self-powered from the monitored voltage, offers 1 changeover output contact, and is housed in a 17.5 mm wide DIN-rail case. Seven Star LLC supplies the RM17TA00 in Oman and the GCC as an independent supplier based in Muscat.

The datasheet we reviewed is dated 7 Nov 2026. It describes a unit without a test button on the front.

Technical specifications of the RM17TA00

Output contacts and durability of the RM17TA00

The output is 1 changeover contact, rated 5 A nominal at up to 250 V AC, with a switching capacity of 1250 VA and a minimum switching current of 10 mA at 5 V DC. The listed durability is 100000 cycles electrical and 30000000 cycles mechanical. The contacts of the RM17TA00 are intended for pilot duty such as contactor coils, signal lamps and PLC inputs. For larger loads use an interposing contactor and keep the relay contact for the control circuit.

Because the minimum switching current is small, the same output can also feed a low-level signal such as a PLC input, but a contact that has switched heavy inductive loads should not later be reused for low-level signals.

Settings, measurement and timing of the RM17TA00

The measuring range is 208–480 V AC. Time delay: Adjustable 0.1–10 s, ± 10 % of the full scale value Tt- time delay upon fault. Hysteresis is 2%. Response time: < 200 ms (in the event of a fault). Reset time is listed as 1500 ms time delay.

When commissioning the RM17TA00, set the thresholds against the real running values of the plant, not against the nameplate alone. Where an adjustable fault delay is available, a longer time suits starting transients and short disturbances, while a short time protects equipment faster. Note the dial positions on the commissioning sheet so the settings can be restored after maintenance.

Selection checklist for the RM17TA00

• Network voltage and frequency, three-wire or four-wire.
• Which faults matter: phase loss, sequence, asymmetry, over or undervoltage.
• Number of output contacts and their rating.
• Fault delay and whether the relay supplies itself from the monitored voltage.
• Width 17.5 mm on the rail and enclosure space.
• Approvals and temperature limits against the project specification.

Installing and commissioning the RM17TA00

The relay clips onto a 35 mm DIN rail. The datasheet lists the operating position as Any position without derating. Terminals are screw type: Screw terminals, 1 × 0.5–1 × 4 mm² (20 AWG–11 AWG) solid without cable end; Screw terminals, 2 × 0.5–2 × 2.5 mm² (20 AWG–14 AWG) solid without cable end. Tightening torque is 0.6–1 N.m conforming to IEC 60947-1.

Before energising the RM17TA00, check the nameplate range against the supply and compare the wiring with the diagram on the datasheet and on the side of the housing. Switch on and confirm the green supply LED and the output indication. Then provoke the monitored fault in a safe way, for example by removing a fuse on a spare circuit or by simulating the condition, and confirm that the output behaves as intended.

Environment, insulation and approvals for the RM17TA00

Storage is listed at -40 to 70 °C. Operation is listed at -20 to 50 °C. Relative humidity is 95 % at 55 °C conforming to IEC 60068-2-30. Protection is IP20 (terminals) conforming to IEC 60529, pollution degree 3 conforming to IEC 60664-1, rated insulation voltage 400 V conforming to IEC 60664-1. The housing is polycarbonate.

Certifications listed on the datasheet for this reference: GOST, CSA, GL, C-Tick, UL. Check the marks against your project specification, because requirements differ between sites.

In a closed panel in an Omani summer the air near the relay can be much hotter than the room, so leave space around it and keep it away from contactors and power resistors.

Where the RM17TA00 is used in Oman and the GCC

Typical uses include pump stations, air-conditioning plant and workshop machinery fed from three-phase panels, where a lost or reversed phase would damage the motor. It is also found in camps, desalination skids and packaged plant that are connected on site by different crews, so the sequence cannot be trusted until it is checked, and in generator-backed supplies and long overhead feeders, where supply quality varies more than on a stable utility network. Heat, dust, humidity and unstable supplies make supervision relays a low-cost way to protect larger equipment, but project specifications and local rules decide which protection is required.

Information to send with an RFQ for the RM17TA00

• Exact reference RM17TA00 and quantity.
• Supply voltage, frequency and type of network.
• The load or machine being supervised and the required alarm or trip behaviour.
• Required contact arrangement and rating.
• Related relays, sockets or accessories needed on the same order.
• Delivery location and timeline.

Documents and quotation

The Schneider Electric datasheet for the RM17TA00 is attached on this page and holds the complete specification summarised above, as printed on the manufacturer’s document dated 7 Nov 2026.

Send us the reference RM17TA00, quantity and delivery location and Seven Star LLC will reply to your request. We supply as an independent supplier based in Muscat and do not act for the manufacturer.