Schneider Electric 28910 ComPacT INS125 3P 125 A Switch

28910 switch-disconnector: what the reference means

If a panel schedule asks for a 125 A, 3-pole load-break switch, the 28910 is the ComPacT INS125 entry that matches. The datasheet describes it as a switch disconnector with rotary handle, black handle, fixed mounting and front connections upstream and downstream.

The datasheet gives the range as ComPacT and the product name as ComPacT INS. The reference corresponds to INS125, 3P, with a conventional free-air thermal current of 125 A at 60 °C. Rated operational voltage is 690 V AC at 50/60 Hz and 125 V DC, and the rated insulation voltage is 800 V AC.

28910 technical specifications

Short-circuit making capacity and withstand data for the 28910

Making capacity is stated two ways. On its own it is rated 20 kA at 690 V AC. Behind an upstream protective circuit breaker the datasheet gives 154 kA at 690 V AC, which is the figure to use when the prospective fault level at the board is high but a suitable breaker sits ahead of the switch.

Short-time withstand current Icw, to IEC 60947-3, is 5.5 kA for 1 s; 3.175 kA for 3 s; 1.23 kA for 20 s; 1 kA for 30 s. Electrical durability is up to 1500 cycles in the categories the datasheet details, against 15000 cycles mechanical. The rated duty is uninterrupted. An intermittent duty class of 120 at 60 % is also listed.

Selection checklist and RFQ details for the 28910

• Part number 28910, quantity and required delivery place
• Load current and category: AC-22A, AC-23A or DC, against the 125 A rating
• System voltage; it is rated 690 V AC and 125 V DC
• Number of poles: 3P here; state whether the neutral must be switched
• Prospective short-circuit current and the upstream breaker, using the 154 kA making figure
• Panel space against 100 × 135 × 62.5 mm and the 30 mm connection pitch
• Any handle, interlock or enclosure accessories needed for the installation

Utilisation categories and ratings of the 28910

Ratings on a switch-disconnector depend on the duty category, so the 125 A on the nameplate is only the starting point. The datasheet lists the current for each category and voltage.

For motor duty the datasheet gives maximum AC-23 power of 55 kW at 380/415 V, 75 kW at 500/525 V and 75 kW at 660/690 V. Because this is a 3-pole unit, the DC ratings apply with two poles in series, which limits DC use to 125 V.

Isolation, handle and mounting of the 28910

The datasheet confirms suitability for isolation and a contact position indicator, but also states that there is no visible break. If your operating procedure needs a visibly open gap, that must be dealt with another way. The control is a rotary handle in black, with fixed mounting on DIN rail or Plate.

The housing measures 100 × 135 × 62.5 mm with a connection pitch of 30 mm and weighs 0.8 kg. Protection is IP40 to IEC 60529 and IK07 to EN 50102, pollution degree 3, with operation from −25 to 70 °C and storage from −50 to 85 °C.

28910 against the neighbouring INS ratings

Neighbouring ComPacT INS references are shown below by current and poles. This unit is the INS125 3-pole line; the comparison is useful when a feeder is being re-rated or when two board layouts use different frame sizes.

Three poles or four: where the 28910 sits

A three-pole unit of this kind switches the three phases only. It is the natural choice for three-phase loads with no switched neutral, and its DC rating is 125 V with two poles in series. If the installation needs the neutral to be switched as well, move to the four-pole sibling of the same size.

The 135 mm housing is shared by the 100, 125 and 160 A ratings, so a change of rating inside this frame leaves the cut-out and the busbar layout unchanged. The pitch is 30 mm, and the unit is only 62.5 mm deep.

Between sizes the weight rises noticeably: this 125 A unit weighs 0.8 kg, while the datasheets across the INS40 to INS400 range run from 0.5 kg for the three-pole INS63 up to 4.9 kg for the four-pole 400 A version. The enclosure space behind the front plate and the busbar or cable access are therefore worth checking before the order, not after delivery.

Using the 28910 in Oman and the GCC

A 125 A load-break switch of this class typically appears in machine-level isolation, motor control centre feeders and pump skid panels. In Oman and the GCC those panels sit in desalination and water plants, power auxiliaries, oil and gas utilities and commercial buildings, where heat, dust and humidity are daily conditions. The housing is IP40, so outdoors or in dusty rooms it belongs inside a suitably rated enclosure.

Operation is rated up to 70 °C ambient, so in a hot Gulf switchroom the temperature inside the enclosure, and the lug temperature rise at full load, should be checked against that limit.

Documents and quotation

The Schneider Electric manufacturer datasheet for the 28910 is attached on this page as a PDF. It is the reference for every rating quoted above, and it is worth checking the revision against your project documents before an order is placed. Making capacity, withstand currents and the full list of utilisation categories are in it.

Seven Star LLC is an independent supplier in Muscat that serves buyers in Oman and the GCC. Send the part number 28910, the quantity and the delivery site, and we will reply with a quotation and the availability we can confirm.