Schneider Electric 33487 NS800 NA 800 A Switch-Disconnector

33487: Compact NS800 NA 800 A switch-disconnector, 3 poles

The 33487 is not a circuit breaker in the protective sense. Schneider Electric lists it as a molded case switch-disconnector, Compact NS800 NA, 800 A, 3 poles, from the ComPact NS family. Its job is to make, carry and break load current and to give a visible-status isolation point, while the protection comes from a separate breaker or fuse upstream. Seven Star LLC supplies the 33487 in Oman and the GCC as an independent supplier based in Muscat.

The performance level is given as NA, the device is of the fixed-mounting type with toggle control, and the datasheet identifies the offer type as C4. The datasheet also carries a discontinued notice dated 31 Mar 2024, so confirm availability or an alternative before using it on a new project.

Technical specifications of the 33487

How a switch-disconnector differs from a breaker

A switch-disconnector is selected by its load-making and load-breaking duty and by its withstand ratings, not by trip curves. The datasheet therefore gives the AC-23A category rating of 800 A across the whole voltage range up to 690 V. AC-23A covers switching of motor loads and other highly inductive loads, which is a demanding duty, so the figure is useful when the device is used as a motor-circuit or main isolating switch.

There is no trip unit and no adjustable protection in the datasheet. If a fault occurs downstream, the device does not clear it by itself; it must be protected by a breaker or fuses ahead of it that coordinate with its Icw and Icm values. This is a common arrangement for a bus-section, a main isolator on a transformer output, or a disconnector for maintenance on a feeder.

Withstand and making capacity of the 33487

Two numbers decide whether the switch-disconnector survives the fault level at its location. The first is the short-time withstand: 25 kA for 0.5 s, or 4 kA for 20 s. The second is the short-circuit making capacity Icm, 52 kA at 690 V AC, which is the peak current the device can close onto.

To check an installation, compare the prospective fault current at the board with those figures and with the let-through of the upstream protective device. Where the upstream device limits the fault energy strongly, the real stress may be lower than the prospective value, but that coordination data comes from the manufacturer’s tables, not from this datasheet.

Where the 33487 fits

The Compact NS800 NA belongs to the same frame family as the NS800 and NS630b to NS1600 breakers, with identical outline dimensions of 210 x 327 x 147 mm and the same 70 mm front connection pitch. A switch-disconnector can therefore be mounted in the place of a breaker of that frame when only isolation or switching is needed and protection is provided elsewhere.

Related references that Seven Star LLC handles in the same family include the 800 A four-pole breaker 33555 with MicroLogic 5.0, the 1000 A breaker 33558 and the 630 A breaker 33546. These are breakers with trip units, and so serve a different purpose from the 33487, but share the frame size and the front connections.

Installation and operation of the 33487

Mount the 33487 on a backplate and connect the busbars or cables to the front terminals on the 70 mm pitch, checking tightening torque against the installation instruction of the manufacturer. The datasheet lists a contact position indicator but no visible break; if the site isolation procedure demands a visible gap or a lockable position, confirm how that will be provided before relying on the device as the sole point of isolation.

Mechanical durability is 6000 cycles and electrical durability 1000 cycles at 440 V AC, which is less than the 10000 mechanical cycles of the breakers in the same frame family; for a switch operated daily, count the operations. Inspect terminals and the housing at each shutdown, and keep the device inside an enclosure suited to pollution degree 3.

Using the 33487 in Oman and the GCC

In Oman and the GCC, a molded-case switch-disconnector of this size is typically seen as a main isolator on a transformer secondary, a bus-coupler or a feeder isolator for a motor control centre in oil and gas camps, desalination units, power stations and large buildings. The operating ambient is stated as -25 to 70 °C, which leaves some headroom for hot switchrooms, but dust and humidity make a sealed enclosure with ventilation or air conditioning worthwhile.

Selecting the right isolating device: checklist for the 33487

• Confirm the duty: isolation and switching only, with protection upstream, versus protection and switching in one device.
• Check the 800 A AC-23A rating against the load current and voltage, up to 690 V AC.
• Compare prospective fault current with Icw (25 kA for 0.5 s) and Icm (52 kA).
• Check how isolation will be proven or padlocked, since no visible break is listed.
• Check availability, because the datasheet shows the device as discontinued.

Information to send with an RFQ for the 33487

Please include the part number 33487, the quantity, the system voltage and prospective fault level, the intended upstream protective device, and the delivery location in Oman or the GCC. If you are replacing an existing device, a photo of the nameplate helps us confirm the match.

Documents and quotation

The official English datasheet for the 33487 is attached on this page. It contains the AC-23A ratings, withstand values, dimensions and the discontinued notice referred to above.

To request a quotation, send the part number 33487, the quantity and the delivery location. Seven Star LLC is an independent supplier in Muscat and quotes according to current availability.