Shourt Line by Soft Works Ltd.
Model Railroad Products

SL-PS300-1-27Fp New 24 Volt Pure DC, 12.5 Amp, 300 Watt Output Power

DC Regulated Switching Power Supply for Any Scale Trains - Analog DC or MTS DCC use.

SL-PS300-1-27Fp Power Supply 24V 12.5A 300 W front-rt-top view

SL-PS300-1-27Fp Power Supply 24V 12.5A 300 W frontl-lf-top view

Price: $99.95 New Out of stock

The SL-PS300-1-27F regulated switching power supply outputs 24 volts at 12.5 amps. This supply matches the Digitrax DCS-200 8 amp & the Massoth 1210Z Central Stations, 1203B 12 amp boosters and with our SL-CB-6A circuit breaker with LGB wire harness can power the LGB Central Station and Boosters

  • Universal AC input / full range with PFC (Power Factor Correction)
  • Forced air cooling by built-in DC fan
  • Cooling fan ON/OFF auto control
  • Over load, over voltage, over temperature & short circuit protection
  • 100% full load burn-in test
  • 1 year warranty

PFC enabled efficiency:
Click here to learn why PFC saves you $$$

Mfg: Made in the Taiwan by Potrans

Input Voltage: 120 or 240VAC 47 to 63Hz

Input Current: 12.5 Amps(120VAC) 4 Amps @ 120VAC, 2 Amps @ 230VAC

Output Voltage: 24Volts (Front panel adjustable from 18.4 to 27.4 VDC

Output Current: 12.5 ADC (DC Amps) at 230VAC

Output Current: 300VA (300 watts) at 230VAC

Output Ripple: 150 mv (millivolt) Max. / 2 mv Typical

Dimensions: 215 x 115 x 50 mm

Weight: 2.6 pounds


  • Enclosed regulated switching supply.
  • Over Voltage protected
  • Current protected
  • LED output indicator
  • Terminal strip In/Out
  • PFC - Energy Efficient Switching Supply

M.T.F.B.: > 168K hours ( according to MIL-HDBK-217F at 25°C environment)

Safety approvals: UL, c-UL, TÜV, CB, CE.

Mounting: Bottom; 4 ea. 4-M4 L=5mm & 4ea. 5-m3 L=3mm brass threaded mounted holes. Side; 4 ea. 4-M4 L=6mm brass threaded mounted holes..

Cables: not included. (All cables are included but available for LGB Central Station and/or LGB Booster with our SL-CB-6A Circuit breaker and cable set)

SL-PS300-1-27Fp factory set to 24V

Easily change the output voltage from the front panel

  • Factory Set at 24 Volts
SL-PS300-1-27Fp adjust to high of 27V

Boost the voltage to compensate for line voltage drops.

  • 27.2 Volts Maximum
SL-PS300-1-27Fp adjust to lo of 18V

Lower the voltage to match your engines voltage requirements.

  • 18.8 Volts Minimum
SL-PS300-1-27Fp adjust to 20V

Protect your train's smoke stack heating element, lighting and electronics by setting the voltage of your choice.

Optional AC Cable:
SL-AC-10SW A10' AC Cord & Switch: available soon
  • UL listed
  • 10 feet long
  • 3 wire cable
  • Molded three prong AC plug
  • ON/OFF switch located 1 foot from the end of the cable.
  • Rated 300 Volts,
  • 105 deg. C,
  • 18 AWG with a center green ground wire.

The cable is easily attached to the power supply
using only a screw driver.

The ON/OFF switch makes controlling power
to the supply very easy.

SL-AC-10-SW-3A 10 foot AC cord with switch
Optional power 10' power cord with switch
SL-PS300-1-27Fp with SL-AC-10-SW-3A

To Run Trains on DC power:
  1. Attach an AC grounded power cord to the power supply.
  2. Attach 16 or 18 gauge wires between the supply and 1 or 2 SL-TLCF DC throttles.
  3. Attach wires between the SL-TLC1cv and your track.

This combination provides 200VA of power and 24VDC PURE LINEAR POWER at 12.5 Amps continuous/30 amps peak. Maximum power supply output voltage can be adjusted from 18.8 to 27.2 Volts DC by turning the adjustment control on the supply front Panel. (See photos above)

The power supply is perfect for use with our TLC Shourt Line Throttles shown above with track clips in our SL-PS300-1-27Fp&TLC12F SET (click her to view). The +V Adj. control on the font panel makes this the perfect 12.5 amp 18.8 to 27.2 Volt DC Power supply for DC or DCC (MTS) power.
The power supply power easily power two or three SL-TLC12F Throttles shown above with or without the use of circuit breakers on each SL-TLC12F throttle. You can also substitute LGB 5 amp throttles for the SL-TLC12F but the Shourt Line circuit brakers will be required for the LGB throttles.

To Run Trains on MTS/DDC power::

Attach an AC grounded power cord to the power supply.

  1. Attach two wires between the supply and your DCC central station or booster (Digitrax DCS 200 shown).
  2. Attach wires between the DCC central station or booster and your track.
  3. Plug in the power supply

The SL-PS300-1-27 power supply is a perfect match to the Massoth 1210Z 12 amp booster to provide 12 amps of continuous DCC power. The supply may also be used with other manufactures DCC central stations and boosters.

SL-PS300-1-27 12 Amp Power Supply
Massoth 1210Z 12 Amp Central Station
Massoth 1210Z
= 12 amps of pure MTS/DCC power

For all NMRA DCC AND LGB type I, II and III products

Use this supply and two SL-CB-6A Circuit breakers to power an LGB Central Station and LGB booster with >2X the power and 1/2 the cost of the LGB Transformer. The pure DC power also eliminates the problem of signals not getting to your locos by improving reliability of communication and the supply protects your LGB investment from over and under voltage as well as eliminating line noise from your railroad.

SL-PS300-1-27Fp_w_cord and SL_CB-6A Circuit breaker powering an LGB central station and booster
Get twice the power at 1/2 the cost and solve you LGB MTS reliability problems for good.

SL-PS300-1-27Fp_w_cord and SL_CB-6A Circuit breaker powering an LGB central station and booster rear view
Hook up is done in minutes - just connect the Circuit Breakers to the power supply with a screw driver and then use the supplied wires on each circuit breaker set to power a central station or booster

Shourt Line 6 Amp Circuit Braker
Each SL-CB-6A Circuit Breaker comes pre-wired with a 12 and 24 inch 18 AWG power cables for easy hook up.

Shourt Line SL-CB-6A Circuit Breaker with pre-wired 12 and 24 inch poer calbes attached with isolated crip on connectors
Each SL-CB-6A Circuit Breaker uses isolated crimp on connectors to allow easy removal of power cables for installation. CE and UL approved circuit beaker protects your LGB investment.


The Massoth 1210Z 12 amp Central Station or 1203B 12 amp booster and the SL-PS300-1-27 power supply is a perfect match for MTS/DCC use. The Massoth 1203 B is a new product and available at the Shourt Line in June 2007. The 1203 B has three power units that can be used individually or together to supply 4, 8 or 12 amps of MTS/DCC power. Each of the three units has electronics for automatic loop control without additional hardware. The 1203B output voltage is adjustable from 14 to 22 volts making it applicable for all gauges. Use of NMRA standardized CDE connectors to connect the booster with the central station of your choice.

Massoth is the maker of all LGB electronics and Massoth is the only manufacture that makes DCC/MTS products that meet BOTH NMRA DCC standards AND LGB type I, II and III MTS standards. This means this is the only product line guaranteed to operate ALL your old and new LGB locomotives with type I, II and III decoders as well as all NMRA standard DCC products.

A perfect match; SL-PS300-1-27F (12.5A) + Massoth 1210Z central station, Navigator and receiver for ultimate wireless MTS/DCC Train Control.


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