EN
6M Blokset Drawer Module - Full Width, 600 mm High, up to 630A
6M full-width Blokset drawer module, 600mm height, up to 630A. Space and ventilation for VFDs and large starters. Weld-free 8MF frame, 73.5kA peak. CKD kits.
- Overview
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- Technical Data
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6M Blokset Drawer Module - Full Width, 600 mm High, up to 630A
6M is the largest standard module on the M-Blokset platform, specified when a variable frequency drive, a large starter or a 630A feeder has to sit in a withdrawable compartment. Six module units of height gives it the depth, airflow path and terminal space that a drive genuinely requires.
THE M-BLOKSET PLATFORM
These modules belong to the M-Blokset system, which is a different mechanical platform from the MOLDVOLT drawer range. It is built on an 8MF cold-bent, weld-free frame - the frame is formed and bolted rather than welded, which keeps it dimensionally accurate, lets it be shipped flat and assembled locally, and removes the welding distortion that throws drawer alignment out on a welded structure. Busbars are supported by ZM clamps moulded in flame-retardant PPO, giving 73.5 kA peak withstand, and the system carries up to 2500A with IP20 to IP54 protection and top-mounted pressure relief.
WHY WELD-FREE MATTERS TO YOU
A weld-free frame is the single feature that makes local assembly realistic. A welded frame has to be built in a factory with jigs and then shipped as a finished volume. A bolted frame ships flat, is assembled with hand tools against a drawing, and comes out square every time. That is what converts an imported cabinet into a locally built one - and it is where the freight saving lives, since a cabinet is mostly air.
MODULE NOTATION
Module height is expressed in M units, where 1M equals 100 mm of compartment height. A 3M module is 300 mm high and full width; a 4M/2 module is 400 mm high and half width, so two sit side by side in one compartment; a 6M module is 600 mm high and full width.
WHY A DRIVE NEEDS THIS MUCH SPACE
A variable frequency drive is a heat source before it is a switching device. It needs airflow across its heatsink, clearance from neighbouring equipment, and terminal space to land screened motor cable properly. In an undersized compartment the sequence is predictable: the drive derates, then it trips on over-temperature on the hottest afternoon of the year, and then the client concludes the drive brand is unreliable. The compartment was the fault.
In a Gulf switchroom running at 50-55 C against an IEC reference ambient of +40 C, this is a first-order effect. State the derated rating for the actual internal temperature in your submittal, not the nameplate figure - on Middle East and African projects that one line separates an engineered bid from a copied one.
EMC IS PART OF THE COMPARTMENT DESIGN
Drives produce conducted and radiated interference. 6M compartment supports 360-degree screen termination of the motor cable, segregation of power and control wiring, and space for input filters and output reactors on long motor runs. Where the board is CE marked under the EMC Directive this is a compliance requirement, and it is a common weakness in locally built boards.
WHERE THE HOT SPARE PAYS FOR ITSELF
A large drive feeder is the feeder whose failure stops the plant. A spare 6M module on the shelf converts a multi-day drive replacement into a racking operation. This is a conversation to have at tender stage, because the spare is cheap relative to the production it protects and expensive relative to nothing at all.
SUPPLIED READY OR AS A KIT
Assembled, wired, labelled and individually tested to your feeder schedule, drive and device brand to your specification, with a routine test certificate. Or as a CKD kit with shell, isolating contacts, racking mechanism, interlock, handle, secondary plug, pre-cut modular harness, assembly drawing and torque sheet.
PRIMARY APPLICATIONS
- Variable frequency drive feeders in M-Blokset motor control centres - the principal use of this module size.
- Large motor starters from approximately 90 kW to 250 kW.
- Distribution feeders up to 630A in Blokset-platform boards.
- Large soft starter feeders with bypass contactor and reactor.
- Main process drives: mill motors, long 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 compressor feeders.
- Sub-main feeders from a main board to a downstream motor control centre.
TYPICAL CONFIGURATIONS
VFD feeder with MCCB, drive, input reactor or filter and bypass arrangement; large soft starter with bypass; heavy star-delta or direct-on-line starter with electronic motor protection; 630A distribution feeder with metering and electronic protection.
WHY BUYERS SPECIFY IT
Because these are the feeders that carry the plant. The specification decision is driven by the physical envelope and thermal requirement of the drive, and by the client's spares strategy for critical drives.
REGIONAL FIT
- Middle East: desalination, district cooling and petrochemical plants run large drives continuously at high ambient. Derating for actual switchroom temperature must be stated in the submittal. SASO SABER for Saudi Arabia, plus DEWA, KAHRAMAA, MEW and Oman DCRP submittals supported.
- Africa: mining and cement main drives. Grid instability makes drive input protection and ride-through configuration important; remote sites make a spare module a practical necessity rather than a luxury.
- Russia and CIS: 380V/220V, EAC under TR CU 004/2011 and TR CU 020/2011.
- Eastern Europe: 400V, CE under LVD 2014/35/EU and EMC 2014/30/EU to EN 61439-2, with EMC compliance on drive feeders actively inspected.
NOT SUITABLE FOR
Drives above the compartment rating, which need a dedicated fixed cubicle with its own ventilation system. MOLDVOLT-platform cabinets, which use the 1/2, 1, 1.5 and 2 unit drawer range. Fixed-type boards such as GGD, XL-21 and JXF.
TECHNICAL DATA - 6M Blokset Drawer Module
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 module | up to 630 A | |
| System rated current (M-Blokset busbar) | up to 2500 A | |
| System rated peak withstand current (Ipk) | 73.5 kA | |
| Rated short-time withstand of the assembly (Icw) | up to 65 kA for 1 s | |
| Control voltage | 230 V AC, 110 V AC, 24 V DC | |
| MODULE GEOMETRY | Module designation | 6M (600 mm height, full width) |
| Module width | full compartment width | |
| Module height | 600 mm (1M = 100 mm) | |
| Modules per standard section | up to 3 modules of this size in a standard section, arrangement dependent | |
| Interchangeability | dimensionally identical across production batches and years | |
| M-BLOKSET SYSTEM CONSTRUCTION | Frame | 8MF cold-bent, weld-free, bolted assembly - ships flat, assembles square |
| Busbar support | ZM clamps moulded in flame-retardant PPO | |
| Busbar | electrolytic copper, silver-plated bolted joints | |
| Pressure relief | top-mounted | |
| Protection degree | IP20 to IP54 depending on configuration | |
| Internal separation | Form 3b / Form 4b per IEC 61439-2 | |
| 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 with position indicator | |
| INTERLOCKS | Interlock Functions | 1. Module cannot be racked while the device is closed 2. Device cannot be closed between defined positions 3. Door interlocked with device position, defeatable by tool for authorised access 4. Padlocking provision in the Disconnect position |
| FEEDER DEVICE | Applicable MCCB / Starter | MCCB frame up to 630 A, or drive and starter feeders up to approximately 250 kW |
| Feeder types | variable frequency drive feeder, large soft starter with bypass, heavy 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 | |
| Drive accessories | input reactor or EMC filter, output reactor for long motor cable runs, 360-degree screen termination gland plate | |
| WIRING | 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 MODULE | 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 |
OPTIONS
Spare module for hot standby | electronic motor protection relay with Modbus,
Profibus or Profinet | earth fault protection | metering | thermistor input |
60 Hz verification for Saudi Arabia | tropicalised coating | IP54 configuration |
CKD module kit for local assembly
NOTE
Specify this module for any variable frequency drive feeder on the Blokset platform. State the drive derating for the actual switchroom ambient rather than the 40 C nameplate rating - in Gulf and African switchrooms the difference is significant and it is the most common cause of summer over-temperature tripping.
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 - 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.
