Loop Power Supplies 4-20 mA

lifetime warranty
  • Lifetime Warranty on API Modules
  • Status LED
  • Full I/O/Power Isolation

Click on PDF links below
for product information

Literature and Links

API product brochure

Options & accessories

Cross reference

Reference Info

Ohm's Law
Installation FAQs
Sink vs Source

How to Order

  1. Select a model
  2. See data sheet for ordering info and power options
  3. Request an API price list via chat
  4. 2 day to 4 week day typical lead time (USA customers)
  5. To place your order
Model Input/Output Features Product

24 VDC Loop Power Supply


Open Datasheet
Download Datasheet

Open Installation Manual
Download Installation Manual

Click to see ALL Seneca products

Download CAD Drawing
Input Power
110 VAC to 230 VAC, 47-63 Hz, 0.7 A, or
110 VDC to 315 VDC, 0.7 A

24 VDC ±2%, 1.5 A max.

  • 1 year warranty
  • 1.5 kV isolation
  • LEDs for input power and status
  • "Power good" status relay
  • Short-circuit and over-load protection


Loop Power Supply

Hart Compatible

Sineax B 812

Open Datasheet
Download Datasheet

Open Instruction Manual
Download Instruction Manual
4-20 mA, 18 to 25.5 VDC
Source resistance: 330 Ω

4-20 mA, 17 VDC no load
Permitted load: 750 Ω, 550 Ω with HART

Specify power: 60-265 VAC/VDC or
20-70 VAC/VDC
  • 1 year warranty
  • 3.6 kV input, output, and power isolation
  • Red LED for open and short circuit fault detection
  • Designed for HART protocol
Hart logo

Sineax B812
B 812
Discontinued Power Supplies
API 9046 G CH API bipolar power supplies (discontinued)
API 9046
Regulated DC Power Supplies (discontinued)
Sineax B 840
Sineax B 840 Instructions
4 channel 4-20 mA loop supply (discontinued)