RA / RAB / COMPASS mSD, mSDF — LV rotary disconnector switches with snap-action drive 80–1 250 A
Country: Poland · Model: RA / RAB / COMPASS mSD, mSDF
The RA, RAB and COMPASS rotary disconnector switches cover currents from 80 to 1 250 A, and the quick-acting snap-action drive opens the contacts regardless of how fast the handle is turned. In three-phase networks the devices are installed as main and outgoing switches of LV switchboards, in substation switchgear, MCC panels, renewable-energy panels and charging-infrastructure panels.
- RA
- 100, 160, 250, 400, 630, 1 250 A; I-0-II changeover switches 160–1 250 A; RA/O — replacement of disconnectors 400–1 250 A
- RAB (with fuses)
- RAB 000 (100 A), 00 (160 A), 1 (250 A), 2 (400 A), 3 (630 A)
- COMPASS mSDF
- with fuses NH000–NH1, 80/160/250 A
- COMPASS mSD
- 160/250/315 A; mSD 315: Un 690 V, AC-23B, DC-22B 440 V, Icm 8 kA, Ui 1 000 V, Uimp 8 kV, 8 000 mech./1 000 switching ops
Technical specifications
| RA | 100, 160, 250, 400, 630, 1 250 A; I-0-II changeover switches 160–1 250 A; RA/O — replacement of disconnectors 400–1 250 A |
|---|---|
| RAB (with fuses) | RAB 000 (100 A), 00 (160 A), 1 (250 A), 2 (400 A), 3 (630 A) |
| COMPASS mSDF | with fuses NH000–NH1, 80/160/250 A |
| COMPASS mSD | 160/250/315 A; mSD 315: Un 690 V, AC-23B, DC-22B 440 V, Icm 8 kA, Ui 1 000 V, Uimp 8 kV, 8 000 mech./1 000 switching ops |
| Operation | manual independent snap-action |
| Insulation | double break in each pole, silver-plated contacts, V0 per UL94 |
| Conditions | −25…+55 °C, up to 2 000 m; temperate climate, T, M; outdoors — in an enclosure ≥ IP34 |
| Standards | PN-EN IEC 60947-1, -3 |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The RA at 100, 160, 250, 400, 630 and 1 250 A is fixed to the switchgear structure; each current path has a double insulating break, and the contacts are silver-plated. The series includes I-0-II changeover switches at 160–1 250 A, and the RA 400/O, RA 630/O and RA 1250/O versions replace obsolete disconnectors. The RAB has built-in fuses; its sizes RAB 000, 00, 1, 2 and 3 correspond to 100, 160, 250, 400 and 630 A, in the "0" position the fuse links are fully isolated, and the contacts are self-cleaning. The modular COMPASS family consists of the mSD up to 315 A and the mSDF for NH000–NH1 fuse links from mSDF 80 to 250 A, in three- and four-pole versions. The through shaft is placed at the front or at the side, three miniature devices are connected directly to the unit, the door is interlocked in the ON state, and the cover does not allow the fuse links to be removed in the ON position. COMPASS housings made of halogen-free glass-fibre plastic are so compact that they fit into switchgear with withdrawable cassettes. The insulating materials of all series are self-extinguishing, class V0 per UL94.
How to choose
First decide whether a fuse is needed in the device itself, because the RA and mSD work without fuse links, and the RAB and mSDF with them. Above 630 A and up to 1 250 A only the RA remains. If NH fuse links have to be placed on a busbar bridge, look at the cassette-type RBK pro at 125–630 A.
Request a price and lead time
RA / RAB / COMPASS mSD, mSDF — LV rotary disconnector switches with snap-action drive 80–1 250 A. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What are the parameters of the COMPASS mSD 315 disconnector switch?
Thermal current 315 A, 690 V, categories AC-23B and DC-22B at 440 V, Icm 8 kA, Ui 1 000 V, Uimp 8 kV. Mechanical endurance 8 000 cycles, switching endurance 1 000, protection degree IP20, compliance with PN-EN IEC 60947-1 and 60947-3.
How does the RA differ from the RAB?
The RA switches a circuit without fuses at 100–1 250 A, while the RAB with built-in fuse links is made up to 630 A.
In what conditions can the RA and RAB switches be installed?
In enclosed rooms free of dust, aggressive and explosive gases, from −25 to +55 °C, at altitudes up to 2 000 m, in temperate, tropical (T) and marine (M) climates. Outdoors only in a cabinet with IP34 or higher.
What is the RA 630/O version for?
It is installed in place of an obsolete disconnector in a live switchgear; such versions exist for 400, 630 and 1 250 A.
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