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 options
  3. Note that options affect pricing
  4. Request a quote via chat or call us
  5. 2 day to 4 week day typical lead time (USA customers)
  6. To place your order
Model Input/Output Features Product

24 VDC Loop Power Supply

Z-SUPPLY  $199 *in stock*

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 Series DC power supplies (discontinued)
Sineax B 840
Sineax B 840 Instructions
4 channel 4-20 mA loop supply (discontinued)