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Beckhoff BK4020

Interbus Bus Coupler

MPN: BK4020
Category: BKxxxx | Bus Coupler

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12-month warranty (new) · 3-month (used/refurbished)
30-day returns, no restocking fee on unused parts
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What is the Beckhoff BK4020?

The BK4020 Economy plus Bus Coupler connects the Interbus bus system to the electronic terminal blocks, which can be extended in modular fashion. One unit consists of one Bus Coupler, any number of up to 64 terminals and one end terminal. With the K-bus

Specifications

Number of Bus Terminals	64 (255 with K-bus extension)
Max. number of bytes fieldbus	64 byte input and 64 byte output
Digital peripheral signals	512 inputs/outputs
Analog peripheral signals	32 inputs/outputs
Configuration	via KS2000
Data transfer rates	500 kbaud
Bus interface	2 x D-sub plug, 9-pin, plug and socket with screening and vibration lock
Data transfer medium	LiYCY 3 x 2 x 0.22 mm²
Power supply	24 V DC (-15%/+20%)
Input current	70 mA + (total K-bus current)/4, 500 mA max.
Starting current	2.5 x continuous current
Recommended fuse	≤ 10 A
Current supply K-bus	1750 mA
Power contacts	max. 24 V DC/max. 10 A
Electrical isolation	500 V (power contact/supply voltage/fieldbus)
Data transfer time	approx. 1 ms in the case of 10 modules for 32 bit input and output each
Weight	approx. 170 g
Operating temperature	0…55°C
Storage temperature	-25…+85°C
Relative humidity	95%, no condensation
Vibration/shock resistance	conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission	conforms to EN 61000-6-2/EN 61000-6-4
Protect. rating/installation pos.	IP20/variable
Approvals/markings	CE, CCC, UL, ATEX, IECEx
Ex marking	ATEX: II 3 G Ex ec IIC T4 Gc IECEx: Ex ec IIC T4 Gc
Design form	compact terminal housing with signal LEDs
Material	polycarbonate
Installation	on 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means of	double slot and key connection
Marking	labeling of the BZxxxx series
Wiring	solid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver
Connection cross-section	s: 0.08…2.5 mm², st: 0.08…2.5 mm², f*: 0.14…1.5 mm²
Stripping length	8…9 mm
Current load power contacts	Imax: 10 A
Dimensions (W x H x D)	51 mm x 100 mm x 69 mm

BK4020: frequently asked questions

When can BK4020 be shipped?

BK4020 is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up BK4020 in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for BK4020 and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for BK4020, subject to availability and destination.