Schneider Electric RE48AML12MW Harmony Timer Relay

RE48AML12MW: panel-mounted/plug-in timer relay with 0.02 s to 300 h timing

The RE48AML12MW is a Schneider Electric Harmony timer relay in the panel-mounted/plug-in timer relay format, component name RE48A. It offers 4 timing functions, a relay output with 2 changeover contacts, a rated supply of 24–240 V AC/DC, and a body 48 mm wide. Time can be set from 0.02 s to 300 h through 14 selectable ranges. Seven Star LLC supplies the RE48AML12MW in Oman and the GCC as an independent supplier based in Muscat.

Supply and output of the RE48AML12MW

RE48AML12MW is rated for 24–240 V AC/DC over a range of 0.85–1.1 Us AC; 0.9–1.1 Us DC, drawing 6 VA at 240 V and 2 W at 240 V. Because the supply span is wide, a single part can cover several control voltages, though the lowest figure on the span is the practical minimum for a dependable pick-up. The datasheet immunity to microbreaks is 5 ms.

The output is a relay stage with 2 C/O timed contacts, AgNi (cadmium free), rated for 5A at up to 250 V AC/DC, with a minimum switching current of 100 mA. Electrical durability is listed as 100000 cycles and mechanical durability as 30000000 cycles.

Mounting, terminals and environment for the RE48AML12MW

The body is 48 mm wide and weighs 0.14 kg. The datasheet lists these mounting options: Base mounted: socket; Panel mounted: system supplied with the product.

Protection degrees are listed as IP40 (housing) conforming to IEC 60529; IP50 (front face) conforming to IEC 60529. Humidity tolerance is 93 % without condensation conforming to IEC 60068-2-3. Vibration resistance is 0.35 mm (f= 10–55 Hz) conforming to IEC 60068-2-6. Operation is listed over -20–50 °C and storage over -40–70 °C. Inside a closed Gulf enclosure in summer the air around a timer sits well above room temperature, so leave space around RE48AML12MW and keep it away from contactor coils and drives.

Technical specifications of the RE48AML12MW

Where the RE48AML12MW is used in Oman and the GCC

In Omani and wider GCC plants a timer of this type is typically chosen for general-purpose timing on panels where one device must cover several jobs, from start delays to pulses and flashers, keeping a single spare type that can replace several fixed-function relays and retrofits where the exact timing mode is only decided during commissioning. Oil and gas skids, power auxiliaries, desalination and water treatment packages and general industrial panels all use this class of device, and the combination of heat, dust and humidity makes sealed enclosures and clean terminal work important. Where timing is part of a safety function, the project specification and a suitable safety device take precedence over a general-purpose timer.

Timing functions and time ranges of the RE48AML12MW

This unit lists the following timing functions, each named by its datasheet code.

• A: Power on-delay. The timing period begins when the supply is applied, and the output changes state only after it has run out.
• B: Single interval started by a control signal. One timed output pulse is produced each time the control input acts.
• C: Off-delay started by a control signal. The output closes with the control input and holds for the set time after it is released.
• Di: Symmetrical flashing that starts with the output on, with equal on and off periods.

The setting covers 0.02 s to 300 h in total, split across these ranges: 0.02 to 1.2 s; 0.05 to 3 s; 0.2 to 12 s; 0.5 to 30 s; 2 to 120 s; 5 to 300 s; 0.2 to 12 min; 0.5 to 30 min; 2 to 120 min; 5 to 300 min; 0.2 to 12 h; 0.5 to 30 h; 2 to 120 h; 5 to 300 h. The datasheet gives a setting accuracy of ± 5 % of full scale at 25 °C conforming to IEC 61812-1; ± 10 % of full scale at 25 °C conforming to IEC 61812-1 and a repeat accuracy of ± 0.2 % of the maximum setting value conforming to IEC 61812-1, with drift of ± 0.02 %/°C of the maximum setting value conforming to IEC 61812-1 against temperature and ± 0.2 %/V of the maximum setting value at 48–240 V; ± 1 %/V of the maximum setting value at 24–48 V against supply voltage. Pick the range whose upper end is closest above the time you need, because accuracy is quoted as a share of full scale.

Selection and installation checklist for the RE48AML12MW

• Function: confirm the timing mode (A, B, C, Di) against the sequence diagram on the datasheet.
• Time: choose a range between 0.02 s to 300 h with the upper limit just above your set point.
• Supply: 24–240 V AC/DC, with the wiring and source verified before energising.
• Output: 2 changeover contacts, checked against the real load current and voltage.
• Fit: 48 mm wide, with the mounting type matching the panel.
• Front panel: Selector switch front panel; Without test button.

Isolate and prove dead before wiring, mount this unit, connect the supply and output terminals, set the function and range, then run the sequence with a test load before the plant is released. Re-check the set time after any change to supply voltage or ambient conditions, and keep a record of the final setting on the panel drawing.

The RE48AML12MW among Harmony timer relays

Width, output type, supply span and function set separate the references. The table compares this unit with its closest neighbours from the same lane.

Information to send with an RFQ for the RE48AML12MW

• Exact reference RE48AML12MW and the quantity.
• Required timing function and set time.
• Control supply voltage and whether AC or DC.
• Load type and current on the output.
• Any matching socket, base or accessory needed.
• Delivery location and required date.

Documents and quotation

The Schneider Electric datasheet for the RE48AML12MW is attached on this page and carries the full specification and function diagrams. Its date is 7 Nov 2026, as printed on the manufacturer’s document, so check the status of the part before ordering.

Send the reference RE48AML12MW, 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.