Schneider Electric SR2D101BD Zelio 10 I/O 24 V DC Relay

SR2D101BD: Zelio Logic smart relay with 10 I/O on 24 V DC

The SR2D101BD is a Schneider Electric Zelio Logic compact smart relay. It packs 6 discrete inputs and 4 relay outputs into a single housing and replaces a small amount of hard-wired relay logic with a programme held in memory. SR2D101BD is the display-less and clockless variant powered from 24 V DC, so the first thing to settle before ordering is that your control supply really matches that figure. Seven Star LLC supplies the SR2D101BD in Oman and the GCC as an independent supplier based in Muscat.

Reading the reference against the datasheet values: the letter after SR2 (D) lines up with no display, no clock; the three digits give the I/O size (10 I/O here); and the suffix (BD) corresponds to the supply of 24 V DC. This reading is our interpretation of the datasheet data rather than a published ordering table, so confirm the exact reference on your drawing before you send an order.

Supply, programme capacity and environmental limits

Rated supply is 24 V DC with limits of 19.2–30 V. The datasheet gives a maximum supply current of 100 mA and a power figure of 3 W, both without extension, which is useful when several units share a small control transformer or a 24 V supply. Reverse polarity protection is fitted.

Operating temperature is −20 to 55 °C, with the lower band of −20 to 40 °C applying in a non-ventilated enclosure; storage is −40 to 70 °C and relative humidity up to 95 % without condensation. Protection is IP20 at the terminal block and IP40 at the front panel, pollution degree 2, overvoltage category III, at altitudes up to 2000 m. In Gulf installations that mostly means the relay belongs inside a closed, ventilated cabinet and not in an open junction box exposed to dust and heat.

The datasheet quotes a programme size of 240 with ladder programming, a cycle time of 6–90 ms, and a programme backup of 10 years at 25 °C. The memory is checked on each power-up. There is no real-time clock in this variant, so time-of-day schedules are not available; the programme is limited to logic, counters and relative timers. If your application needs a weekly timetable, move to a B or E type from the same family. There is no local display, so diagnostics rely on the programming tool and on the status of the wired devices.

Technical specifications of the SR2D101BD

How the SR2D101BD compares with related Zelio Logic references

The table lists the nearest relatives of the SR2D101BD in the same family, taken from their own datasheets. They share the housing style and the screw-terminal wiring but differ in supply, I/O count, display and clock.

Installation, wiring and maintenance of the SR2D101BD

The datasheet specifies screw terminals for 0.2 to 2.5 mm² solid or semi-solid conductors and 0.25 to 2.5 mm² flexible conductors with cable end, with a tightening torque of 0.5 N.m. Wire the supply and input groups in line with the terminal markings, and keep input cabling separate from output cabling that carries inductive loads. For inductive loads on relay outputs, suppression at the load is a standard practice that protects the contacts.

After wiring, power up with the loads disconnected, check each input state, then exercise each output before connecting field equipment. Keep a backup copy of the programme with the project documents so that a replacement unit can be programmed quickly. Site inspections should look at terminal tightness, cabinet temperature and dust build-up on ventilation openings.

Selection checklist for the SR2D101BD

• Confirm the control supply: 24 V DC (polarity matters).
• Count field inputs and outputs: this unit offers 6 inputs and 4 relay outputs; spare capacity should be considered before choosing 10 I/O.
• Check whether the load needs relay contacts.
• Decide on display (absent) and clock (absent) against the programme you intend to write.
• Check the panel space: the datasheet weight is 0.22 kg and the width and depth should be checked on the datasheet drawing.

Typical uses of the SR2D101BD in Oman and the GCC

With 10 I/O on 24 V DC, SR2D101BD fits small automation tasks where a full PLC would be excessive: lighting and signage sequences, simple conveyor and packing interlocks, and tank level and transfer control. In the Gulf these panels face high ambient temperatures and fine dust, so cabinet ventilation and the derating note in the datasheet deserve attention. Utilities, facilities contractors and OEM panel builders use units of this size mainly for standalone sequences, local backup logic and retrofits of ageing relay panels.

Inputs and outputs of the SR2D101BD

The inputs on this unit are 24 V class DC inputs of the resistive type rated 24 V DC at 4 mA, conforming to IEC 61131-2 type 1, with a counting frequency of 1 kHz. The datasheet states that three-wire PNP proximity sensors can be connected directly, which makes the unit a natural fit for sensor-driven sequences. State 1 is guaranteed from ≥ 15 V and state 0 up to ≤ 5 V. This variant has no analogue inputs, so it suits purely on/off signals; if you need to read a level or temperature value pick one of the DC members that list analogue inputs.

The 4 outputs are relay outputs with normally open contacts, switching 24–250 V AC or 5–30 V DC. The datasheet gives a thermal current of 8 A shared across the outputs, a minimum switching capacity of 10 mA at 12 V, and a mechanical durability of 10000000 cycles. Because the contacts are relay-type, one output can switch a mains-powered contactor coil while its neighbour switches a low-voltage signal.

Information to send with an RFQ for the SR2D101BD

• Exact reference SR2D101BD and the quantity required.
• Control supply voltage and frequency available on site.
• Type of loads on the outputs and whether surge suppression is fitted.
• Whether a programming cable or other accessory is needed in the same order.
• Delivery location and any project deadline.

Documents and quotation

The manufacturer datasheet for the SR2D101BD is attached on this page and lists the full specification summarised above. Check the datasheet revision date against your project requirements.

Send us the reference SR2D101BD, quantity and delivery location and Seven Star LLC will reply with a quotation request confirmation. We supply as an independent supplier based in Muscat.