Schneider Electric SR3XT101BD Zelio 10 I/O discrete I/O Module

SR3XT101BD: discrete extension module, 10 I/O on 24 V DC

The SR3XT101BD is a Schneider Electric Zelio Logic discrete I/O extension module. It carries 6 inputs and 4 relay outputs (10 I/O) and adds them to a Zelio Logic modular smart relay of the matching supply type. SR3XT101BD runs on 24 V DC, so the choice between it and its sister reference is decided by the control supply of the base unit. The 10 I/O DC module is the mid-size choice: enough channels to add a pump group or a second ventilation stage to a 24 V DC base unit without jumping to the largest module. Seven Star LLC supplies the SR3XT101BD in Oman and the GCC as an independent supplier based in Muscat.

The reference reads as XT for extension, 10 for the I/O count (here 10) and BD for 24 V DC. This is our interpretation of the datasheet data rather than a published ordering table.

Typical uses of the SR3XT101BD in Oman and the GCC

When a smart-relay panel runs out of channels, this unit is the quickest way to add door, gate and barrier interlocks, additional ventilation fan stages or extra pump start/stop channels on a booster set. The 10 I/O DC module is the mid-size choice: enough channels to add a pump group or a second ventilation stage to a 24 V DC base unit without jumping to the largest module.. In the Gulf, this class of module appears in building services, utility auxiliaries, water-treatment skids and OEM panels where a PLC would be oversized and ambient heat calls for a ventilated enclosure.

Selection checklist for the SR3XT101BD

• Match the supply: 24 V DC; a base unit on the other supply needs the other suffix.
• Count the channels still missing: this module adds 6 inputs and 4 relays.
• Check the load schedule against 8 A for all 4 outputs.
• Make sure the sensors are 24 V DC PNP-compatible types.
• Confirm the base unit can accept extensions; the datasheet connection diagrams show modular units with modules of the same supply type.

Technical specifications of the SR3XT101BD

Supply and environmental limits

The rated supply is 24 V DC with limits of 19.2–30 V. Reverse polarity protection is listed. The datasheet lists impulse withstand of 4 kV and overvoltage category III. Operating temperature is −20 to 55 °C (−20 to 40 °C in a non-ventilated enclosure), storage −40 to 70 °C, humidity up to 95 % without condensation, altitude up to 2000 m. Protection is IP20 at the terminals and IP40 at the front, pollution degree 2.

For Gulf installations the module should live in a closed, ventilated cabinet; the derating line for non-ventilated enclosures is the number to keep in mind when several modules are stacked beside a base unit and a transformer.

Comparing the SR3XT101BD with other Zelio Logic extension modules

The table lists nearby discrete modules from the same series, each from its own datasheet. The analogue module SR3XT43BD is a separate function and is not interchangeable with these.

Installation and maintenance of the SR3XT101BD

The module mounts on a 35 mm DIN rail beside the base unit or is screw-fixed with retractable lugs, and weighs 0.2 kg. Terminals take 0.2–2.5 mm² solid or semi-solid conductors and 0.25–2.5 mm² flexible conductors with cable end, tightened to 0.5 N.m. Datasheet diagrams show a supply protected by a fuse or circuit-breaker and note a 5 A limit on the higher-numbered relays of the 14 I/O modules.

Commission with loads disconnected: apply each input and confirm its state in the base unit, then force each relay and listen for the click before reconnecting field equipment. Keep the programme backed up, and treat the module as a spare item worth holding if the panel runs a critical sequence.

Inputs and outputs of the SR3XT101BD

The 6 inputs are resistive 24 V DC inputs conforming to IEC 61131-2 type 1, drawing 4 mA each with a counting frequency of 1 kHz. State 1 is guaranteed from 15 V and state 0 up to 5 V, and three-wire PNP proximity sensors are listed as compatible, so sensors can be wired directly. The datasheet gives separate current limits for the input groups (state 1 from 2.2 mA or 1.2 mA depending on the terminal group, state 0 up to 0.75 mA or 0.5 mA), which matters when you choose sensors with leakage current.

The 4 outputs are relay outputs with normally open contacts for 24–250 V AC or 5–30 V DC. Thermal current is 8 A for all 4 outputs. The datasheet quotes 500,000 electrical cycles in AC-12 (230 V, 1.5 A), AC-15 (230 V, 0.9 A), DC-12 (24 V, 1.5 A) and DC-13 (24 V, 0.6 A), a minimum switching capacity of 10 mA at 12 V, and a mechanical life of 10 million cycles. Operating rate is 10 Hz without load but 0.1 Hz at rated current.

Information to send with an RFQ for the SR3XT101BD

• Exact reference SR3XT101BD and quantity.
• Base unit reference and its supply voltage.
• Load types on the outputs and any surge suppression fitted.
• Delivery location and project deadline.

Documents and quotation

The manufacturer datasheet for the SR3XT101BD is attached on this page and includes the dimension drawings and connection diagrams. Check the revision date against your project requirements.

Send us the reference SR3XT101BD, quantity and delivery location and Seven Star LLC will reply to your RFQ. We supply as an independent supplier based in Muscat.