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1 Unit Withdrawable Drawer - The Standard Functional Unit, up to 160A

1 Unit Withdrawable Drawer - The Standard Functional Unit, up to 160A

1 unit withdrawable drawer for GCS, GCK and MNS switchgear, to 160A. Three-position isolation, silver-plated contacts, tested. CKD kits available.

Overview
Applications
Technical Data
Services
Quality Control
Recommended Products

1 unit drawer is the reference size of the whole withdrawable system. Most motor starters and most distribution feeders on a real project sit in this size, and every other unit size is described relative to it. If you are building a motor control centre, this is the unit you will make in the largest quantity.

WHAT THE CUSTOMER IS ACTUALLY BUYING
Not a drawer - uptime. On a cement plant, a water treatment works or a food line, a failed motor starter stops production. With a withdrawable board, an electrician racks the failed unit out, racks a tested spare in, and the line runs again in minutes. With a fixed board, the same job means isolating the section, working live-adjacent or shutting down, and hours of lost output. Every serious motor control centre specification in our markets is written around that difference.

THIS IS WHERE LOCAL BUILDERS LOSE MARGIN
Panel builders who try to make their own drawers usually succeed at the shell and fail at the mechanism. Contact alignment, contact pressure, three-position latch geometry and secondary plug engagement are precision work; get them slightly wrong and the drawer functions perfectly on the test bench, then overheats after eighteen months of thermal cycling. We supply the unit assembled, wired and individually tested, so your workshop assembles a cabinet rather than debugging a mechanism, and your warranty exposure drops.

INTERCHANGEABILITY, YEAR AFTER YEAR
Module dimensions are held to the same drawing revision. A 1 unit drawer supplied in year five fits a board built in year one. This is exactly what an in-house drawer design cannot promise, and it is the reason a consultant writes a standardised system into a specification.

BUILT TO YOUR FEEDER SCHEDULE
Send the schedule and we build to it: distribution feeder, direct-on-line, star-delta, soft starter, reversing starter. Device brand to your specification. Each unit is wired to terminals, labelled, individually tested and delivered with its own routine test certificate. Or take the CKD kit - shell, contacts, racking mechanism, interlock, handle, secondary plug and pre-cut harness - with the assembly drawing and torque sheet.

Typical Applications

PRIMARY APPLICATIONS
- Motor starters up to approximately 45 kW in GCK, GCS and MNS motor control centres.
- Distribution feeders up to 160A in withdrawable distribution boards.
- Pump, fan, conveyor, compressor and agitator drives in process plants.
- Cement, steel, mining, sugar, textile and food processing plant MCCs.
- Water treatment, sewage and desalination plant motor control.
- Building services: chiller plant, air handling units, pump sets, lift supplies.
- Petrochemical and oil and gas utility motor control.
- Port, terminal and materials handling drives.

TYPICAL CONFIGURATIONS
Direct-on-line starter with contactor, overload relay and control circuit; star-delta starter for larger motors; reversing starter; distribution feeder with MCCB; feeder with electronic motor protection relay and fieldbus communication.

WHY BUYERS SPECIFY IT
Because a spare 1 unit drawer on the shelf converts a production stoppage into a ten-minute swap. Where the client operates a continuous process, the spares set is usually priced into the original project, and the panel builder who quotes it properly looks like the one who understands the plant.

REGIONAL FIT
- Middle East: heavy MCC demand in desalination, petrochemical, cement and building services. Switchroom ambient of 50-55 C requires derating above the IEC +40 C reference. Witnessed factory acceptance testing is standard on Saudi SEC and comparable utility projects.
- Africa: mining, cement, water and agro-processing. Remote sites make on-site spare drawers an operational necessity rather than a luxury, since a technician visit can take days.
- Russia and CIS: 380V/220V, EAC under TR CU 004/2011 and TR CU 020/2011.
- Eastern Europe: 400V, CE under LVD and EMC to EN 61439-2, frequently with fieldbus motor management specified.

NOT SUITABLE FOR
Motors above the unit rating - step up to 1.5 or 2 unit. Fixed-type boards such as GGD, XL-21 and JXF.

Technical Data

TECHNICAL DATA - 1 Unit Withdrawable Functional Unit

Compliance: IEC 61439-1, IEC 61439-2, IEC 60947-2, GB 7251.1

Category	Item	Parameter Details
ELECTRICAL RATINGS	Rated operational voltage (Ue)	400 V / 415 V AC (380 V available)
	Rated insulation voltage (Ui)	1000 V
	Rated impulse withstand voltage (Uimp)	8 kV
	Rated frequency	50 Hz / 60 Hz
	Rated current of unit	up to 160 A
	Rated short-time withstand of the assembly (Icw)	up to 80 kA for 1 s
	Rated conditional short-circuit current	determined by the fitted device
	Control voltage	230 V AC, 110 V AC, 24 V DC
MODULE GEOMETRY	Module size	full module width, one unit height
	Module height	1 unit
	Units per standard section	up to 18 single units in a standard 1000 mm wide section, arrangement dependent
	Interchangeability	dimensionally identical across production batches and years
ISOLATING SYSTEM	Working Positions	Connect / Test / Disconnect, each positively latched with indication
	Primary contacts	silver-plated copper, spring-loaded, self-aligning
	Secondary contacts	silver-plated multi-pin plug, engages in Test position
	Earth contact	engages before and breaks after the power contacts
	Mechanical endurance	100,000 operating cycles
	Racking mode	manual handle racking, tool-free
INTERLOCKS	Interlock Functions	1. Drawer cannot be racked while the device is closed 2. Device cannot be closed between defined positions 3. Door cannot be opened with the device closed (defeatable by tool for authorised access) 4. Padlocking provision in the Disconnect position
FEEDER DEVICE	Applicable MCCB / Starter	MCCB frame up to 160 A, or contactor-based starter up to approximately 45 kW
	Feeder types	distribution feeder, direct-on-line starter, star-delta starter, reversing starter
	Motor protection	thermal overload relay, or electronic motor protection relay with earth fault and communication
CONSTRUCTION	Shell Material	aluminium-zinc coated steel, powder coated
	Internal separation	Form 3b / Form 4b per IEC 61439-2 when installed
	Protection degree	IP30 to IP54 depending on cabinet configuration
	Wiring	pre-cut modular harness, ferruled and labelled, reducing on-site assembly labour by approximately 30% versus wire-by-wire termination
	Terminals	front accessible, sized for the feeder cable range
TESTING - EVERY UNIT	Factory Test Items	Dielectric withstand 1 minute at rated test voltage; insulation resistance recorded; three-position operation and interlock function verified; contact alignment and engagement gauged; functional test of the feeder logic
SERVICE CONDITIONS	Ambient temperature	-5 ℃ to +40 ℃ per IEC; verified to +55 ℃ with derating
	Relative humidity	50% at +40 ℃, up to 90% at +20 ℃
	Altitude	up to 2000 m

NOTE
This is the reference module size for the whole withdrawable range. All other unit sizes - 1/2, 1.5 and 2 unit - are defined relative to it, and mixing sizes in one section is normal practice.

Services

SUPPLIED READY TO INSTALL - THE HARD PART IS ALREADY DONE

A drawer is not a box with a breaker in it. Contact alignment, three-position interlock geometry and secondary plug engagement are the parts of a withdrawable board that local workshops get wrong, and a misaligned drawer is what turns into a burned contact two years later. We supply the units assembled, wired and tested, so your workshop is building a cabinet - not debugging a mechanism.

1. FUNCTIONAL UNITS BUILT TO YOUR SCHEDULE
Send us the feeder schedule and we build the drawers to it: distribution, direct-on-line, star-delta, soft starter, VFD, reversing. Device brand to your specification. Each unit is delivered wired to terminals, labelled and individually tested.

2. INTERCHANGEABILITY GUARANTEED ACROSS BATCHES
Standard module dimensions are held to the same drawing revision year after year. A 1-unit drawer ordered today fits a cabinet you built three years ago. This is the single reason consultants specify a standardised system, and it is where a proprietary in-house drawer design costs the client later.

3. CKD DRAWER KITS FOR LOCAL ASSEMBLY
If you would rather assemble in-house, we supply the drawer as a kit: shell, isolating contacts, racking mechanism, interlock, handle, secondary plug and wiring harness, with the assembly drawing and a torque and gauge sheet. The pre-cut modular wiring harness alone removes about 30% of on-site assembly labour compared with cutting and crimping wire by wire.

4. TRAINING ON THE MECHANISM
Alignment, contact pressure check, three-position verification, interlock function test and racking force check - taught on your own bench with your own units, on site or by video session.

5. SPARE DRAWERS AND SPARES STRATEGY
Quote the spare drawer set with the main order. A hot spare drawer is what lets a plant restore a feeder in minutes instead of hours, and on EPC projects it is often the reason a withdrawable board was specified in the first place. We keep the design available so spares remain buyable for the life of the installation.

6. DOCUMENTATION FOR YOUR SUBMITTAL
Routine test certificate per unit, device certificates, wiring diagram, drawer schedule and part list. Formatted so it drops straight into your IEC 61439 verification file.

7. AFTER-SALES
24-hour technical response, 12 months from commissioning or 18 months from shipment, spare contact and interlock parts held to the same revision.

8. COMMERCIAL TERMS
FOB, CFR, CIF, DDP, Ex-Works. Mixed loading with cabinets and components. Trade Assurance, T/T, L/C. Sample units accepted before volume.

Quality Control

QUALITY CONTROL - EVERY DRAWER TESTED AS A UNIT

A withdrawable board fails at the interface, not in the middle of a component. Contact pressure, alignment and interlock geometry decide whether the drawer is still healthy after a thousand operations, and none of that is visible after the door is closed. Each unit is therefore tested as a complete assembly before it leaves the line.

DIMENSIONAL AND MECHANICAL CHECKS - 100%
1. Shell dimensions and squareness against the module drawing, so interchangeability with earlier batches is real and not assumed.
2. Isolating contact alignment and engagement depth verified with a gauge; contact pressure measured against specification.
3. Silver plating thickness on primary and secondary contacts checked on batch samples.
4. Three-position operation - Connect, Test, Disconnect - each position confirmed to latch positively with correct indication.
5. Interlock function - the drawer cannot be racked with the device closed, and the device cannot be closed between defined positions. Tested in both directions.
6. Racking operating force measured and recorded; a stiff mechanism is rejected, not adjusted at the customer's site.
7. Earth contact sequence verified - the earth contact must make before and break after the power contacts.
8. Mechanical endurance qualified to 100,000 cycles on type-test samples.

ELECTRICAL CHECKS - 100%
9. Wiring verified against the unit schematic; ferrules, terminal tightness and labelling checked.
10. Secondary plug pin-out verified circuit by circuit.
11. Dielectric withstand test at the rated test voltage for one minute, and insulation resistance measured and recorded.
12. Functional test of the feeder logic - starter sequence, protection relay settings, indication and, where fitted, communication.

WHAT YOU RECEIVE
Individual routine test certificate carrying the unit serial number, drawer schedule, wiring diagram, device certificates, and the type-test evidence for the drawer system to support your IEC 61439 verification file.

TRACEABILITY AND SPARES
Every unit is serialised against its drawing revision. When you order a replacement in five years, the drawer that arrives is the drawer that fits. Sample units are supplied for fit-up trials before volume production, and third-party inspection is accepted on request.