Schneider Electric 31110 ComPacT INS400 3P 400 A Switch

31110 switch-disconnector: what the reference means

The 31110 is a ComPacT INS400 switch-disconnector from Schneider Electric: 3 poles, 400 A, operated by a direct front rotary handle. A switch-disconnector is an on/off device for isolating and switching loads, not a protective breaker, so the datasheet carries no overload or short-circuit trip settings; its job is to open and close the circuit under load and to provide isolation for maintenance.

The datasheet gives the range as ComPacT and the product name as ComPacT INS. The reference corresponds to INS400, 3P, with a conventional free-air thermal current of 400 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.

Utilisation categories and ratings of the 31110

Ratings on a switch-disconnector depend on the duty category, so the 400 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 200 kW at 380/415 V, 250 kW at 500/525 V and 400 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.

31110 technical specifications

Selection checklist and RFQ details for the 31110

• Part number 31110, quantity and required delivery place
• Load current and category: AC-22A, AC-23A or DC, against the 400 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 330 kA making figure
• Panel space against 205 × 185 × 120 mm and the 45 mm connection pitch
• Any handle, interlock or enclosure accessories needed for the installation

31110 against the neighbouring INS ratings

Neighbouring ComPacT INS references are shown below by current and poles. This unit is the INS400 3-pole line; the comparison is useful when a feeder is being re-rated or when two board layouts use different frame sizes.

Isolation, handle and mounting of the 31110

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 direct front rotary handle in black, with fixed mounting on Plate or DIN rail or are subject to change – check with your local distributor..

The housing measures 205 × 185 × 120 mm with a connection pitch of 45 mm and weighs 4.6 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. The datasheet for the separate extended front rotary handle 31052 lists INS320–630 as compatible, for panels where the handle must be remote from the switch.

Three poles or four: where the 31110 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.

With 45 mm between terminals and a 120 mm depth, the INS400 frame is the largest in this group. The handle is a direct front rotary type and the weight is 4.6 kg, so mounting plates and fixings need to be sized for the load, not just for the footprint.

Between sizes the weight rises noticeably: this 400 A unit weighs 4.6 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.

Short-circuit making capacity and withstand data for the 31110

Making capacity is stated two ways. On its own it is rated 50 kA at 690 V AC. Behind an upstream protective circuit breaker the datasheet gives 330 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 20 kA for 1 s; 11.5 kA for 3 s; 4.9 kA for 20 s; 4 kA for 30 s. Electrical durability is up to 1500 cycles in the categories the datasheet details, against 10000 cycles mechanical. The rated duty is uninterrupted.

Using the 31110 in Oman and the GCC

A 400 A load-break switch of this class typically appears in main isolation of sub-boards, large pump or compressor feeders and incomer duty on process 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 31110 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 31110, the quantity and the delivery site, and we will reply with a quotation and the availability we can confirm.