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2 Unit Withdrawable Drawer - up to 400A, for VFDs and Large Feeders

2 Unit Withdrawable Drawer - up to 400A, for VFDs and Large Feeders

2 unit withdrawable drawer to 400A for GCK, GCS and MNS. Depth and ventilation for VFDs and large starters. Factory wired, tested, CKD kits.

Overview
Applications
Technical Data
Services
Quality Control
Recommended Products

2 unit is the largest standard drawer in the range and the one specified when a variable frequency drive, a large starter or a 400A feeder has to sit in a withdrawable compartment. It occupies two module positions, which gives it the depth, ventilation path and terminal space that a drive genuinely needs.

WHY A VFD NEEDS THIS SIZE
A variable frequency drive is a heat source, not just a switching device. It needs airflow across its heatsink, it needs clearance from adjacent equipment, and it needs terminal space for motor cable with screening properly terminated. Put a drive in an undersized compartment and three things happen in sequence: the drive derates, then it trips on over-temperature during the hottest part of the day, and then the customer concludes the drive brand is unreliable. The compartment was the problem.

In a Gulf switchroom running at 50-55 C against an IEC reference of +40 C, this is not a marginal effect. Drive derating must be calculated for the actual internal temperature, and the ventilation arrangement has to be part of the design rather than something added later.

EMC IS PART OF THE DESIGN
Drives generate conducted and radiated interference. 2 unit compartment supports proper 360-degree screen termination for the motor cable, segregation of power and control wiring, and provision for input filters and output reactors where the motor cable run is long. On projects marked CE under the EMC Directive this is not optional, and it is a common weakness in locally built boards.

FACTORY BUILT AND TESTED
Assembled, wired, labelled and individually tested to your feeder schedule, with device and drive brand to your specification, delivered with a routine test certificate. Or supplied as a CKD kit with the shell, isolating contacts, racking mechanism, interlock, handle, secondary plug, pre-cut modular harness, assembly drawing and torque sheet.

INTERCHANGEABLE, AND SPARE-ABLE
Same isolating system, three-position mechanism and interlock scheme as the rest of the range, held to the same drawing revision over time. A large drive feeder is precisely where a hot spare drawer pays for itself, because a drive failure on a main process line is measured in lost production, not in the price of the unit.

Typical Applications

PRIMARY APPLICATIONS
- Variable frequency drive feeders in motor control centres - the main reason this size exists.
- Motor starters from approximately 90 kW to 200 kW.
- Distribution feeders up to 400A in withdrawable boards.
- Large soft starter feeders with bypass and reactor.
- Main process drives: mill motors, large conveyors, crushers, high-pressure pumps, ID and FD fans.
- Cement, mining, steel, paper and sugar plant main drive sections.
- Desalination and water pumping station high-power feeders.
- District cooling and large chiller plant compressor feeders.
- Sub-main feeders from a main board to a downstream MCC.

TYPICAL CONFIGURATIONS
VFD feeder with MCCB, drive, input reactor or filter and bypass arrangement; large star-delta or soft start feeder; 400A distribution feeder with metering and electronic protection; large direct-on-line starter with electronic motor protection relay.

WHY BUYERS SPECIFY IT
Because the largest feeders are the ones whose failure stops the plant. A withdrawable 2 unit drive feeder with a spare on the shelf turns a multi-day drive replacement into a swap, provided the spare is ordered - which is a conversation the panel builder should be having at tender stage, not after the first failure.

REGIONAL FIT
- Middle East: desalination, district cooling and petrochemical plants run large drives continuously in high ambient. Derating for actual switchroom temperature must be stated in the submittal, and SASO SABER and utility approvals supported for Saudi, UAE, Qatar, Kuwait and Oman.
- Africa: mining and cement main drives. Grid instability makes drive input protection and ride-through configuration important, and remote sites make a spare unit a practical necessity.
- Russia and CIS: 380V/220V, EAC under TR CU 004/2011 and TR CU 020/2011, cold-start considerations for outdoor-adjacent switchrooms.
- Eastern Europe: 400V, CE under LVD and EMC to EN 61439-2, with EMC compliance for drive feeders taken seriously by inspectors.

NOT SUITABLE FOR
Drives above the compartment rating, which need a dedicated fixed cubicle with its own ventilation. Fixed-type boards such as GGD, XL-21 and JXF.

Technical Data

TECHNICAL DATA - 2 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 400 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, two unit height
	Module height	2 unit
	Units per standard section	up to 9 units of this size 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 400 A, or starter and drive feeders up to approximately 200 kW
	Feeder types	variable frequency drive feeder, large soft starter with bypass, large star-delta or direct-on-line starter, distribution feeder
	Motor protection	electronic motor protection relay with earth fault, thermistor input and fieldbus communication; drive internal protection
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
Specify this size for any variable frequency drive feeder. The drive needs airflow across its heatsink, clearance from adjacent equipment and terminal space for screened motor cable; an undersized compartment causes derating and over-temperature tripping that is wrongly blamed on the drive.

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.