Who are Work System?
See our brand story to know more about us and our values. 
Skiljerelä 140A

Smartpass 120 (Increases charging 120A when D250SA is installed)

Art. nr:928-DCDC-12A

Separates, prioritises & improves batteries and equipment. NB! This device is a slave to the D250SA and does not operate independently.
253 £
Exclude 20 % vat


Length: 210 mm
Height: 110 mm
Width: 65 mm
Weight: 0.0 KG


Mounting time: 30 Min
Delivery time: 1 day
Warranty: 24 Mon
Product information
NOTE This device is a slave of the D250SA and does not operate independently.
120 A DC/DC energy management solution
Separates, prioritises and improves batteries and equipment
Smartpass 120 charges and supplies service batteries and equipment with 120 A, separates critical equipment from non-critical equipment and ensures that radio, emergency lighting and navigation systems are always powered.
Smart 120 is a 120 A energy management soldering that distributes, controls and maximises the available energy from the generator to power service batteries and extra batteries. The SMARTPASS 120 can handle all 12V batteries between 28 – 800 Ah. The Smartpass 120 battery protection function ensures that critical equipment such as radios, emergency lighting and navigation systems are always powered and prioritised when the extra battery voltage is low and disconnects non-critical consumers. The unit’s battery protection protects your service battery from total discharge and the built-in overheating protection reduces the charging current before the battery temperature becomes too high. SMART 120 is compatible with the D250SA 20A onboard charger.

Battery separation removes diodes and VSR relays
Delivers 120A for fast charging of 28– 500Ah batteries
Compatible with DUAL D250S and delivers up to 140A charging with the D250S DUAL
Prioritises critical extra batteries and delivers directly from generator to extra batteries
Jump start function
Fully automatic
Maximises battery life
Battery protection to protect your secondary battery against deep discharge
Dynamic over-voltage protection to handle temporary in- and outputs up to 350 A for fast charging
Battery temperature protection for increased safety
Splash and dust protected (IP65)
Complete this unit with the D250SA and charge the extra battery with up to 140Ah

Input 11.5-23V, max 120A (350A temporarily for up to 10 seconds)
Output power Max. 14.4V, 120A (350A temporarily for up to 10 seconds)
Back-up current* Less than 7Ah/month
Battery types All types of lead-acid, 12V, WET, MF, Ca/Ca, AGM, EFB, GEL
Battery capacity 28-800Ah
Warranty 2 years
Casing class IP65

Connection kit for inverter 300-700W

The inverter connection kit includes a red & black 16 mm cable, fuse holder, fuse, cable lugs and battery monitor.
120 £
Exclude 20 % vat

Dc/DC Charger D250SE 20A Charging between batteries.

D250SE The new technology between a starter battery and an extra battery. Works like a powerful built-in charger when you’re on the go.
240 £
Exclude 20 % vat

Smartpass 120 (Increases charging 120A when D250SA is installed)

Separates, prioritises & improves batteries and equipment. NB! This device is a slave to the D250SA and does not operate independently.
253 £
Exclude 20 % vat

About Work System


We develop and sell vehicle racking systems for vans and other service vehicles. Most of our solutions are locally produced in the Småland region of Sweden. Småland is not only a well known Swedish holiday destination and setting for Astrid Lindgren's books but also well known for its people's entrepreneurial drive and for being a centre for innovative entrepreneurship. The opportunities to cooperate with suppliers locally contributed largely to our company's success.

In Småland we found everything we needed to successfully start our own business. Our families and friends spent many nights with us working on our ideas and we are eternally grateful for their support. Right now, we have 50 amazing employees who focus all their energies to fill our Work System dream with life and provide our customers with great products and great service.


With its innovative product development and cutting-edge production methods, Work System offers its customers smart racking system solutions for their vehicles at competitive prices.
As our customers' needs differ, we have developed a modular range of racking solutions which can satisfy all types of customer requirements. Our systems belong to the most flexible of its kind in Europe. All shelves are designed in a modular manner which means they can be adapted to your needs. Additionally, Work System solutions can be flexibly extended due their modularity. Thus, you do not have to buy everything at once. Should you for instance need an additional drawer unit in the future this can be easily added to your existing racking system.


Quality matters to us. We listen to our customers' feedback and our racking systems are regularly tested and improved. We use state-of-the-art simulation techniques and send critical parts of our product range to the SP Technical Research Institute of Sweden for crash testing.

The materials we use in production are mostly processed by robots which ensures high precision and lower production costs. All drawers run on ball-bearing rails which mean they can also be operated smoothly when heavily loaded.

We are confident that our products will serve your needs and are happy to offer you a free 36 months guarantee on our whole range of vehicle racking systems (terms and conditions apply).


For most of our customers the most effective use of their van's loading capacity and working time are the two major factors influencing their buying decision. However, many forget the most important factor - safety. Securing all materials and tools safely in your car protects not just you but also others whilst driving your vehicle. Check out our product videos to see what might happen if cargo is not safely secured during a collision.


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