Description
The Honeywell 621-9934 I/O Rack Power Supply Module delivers regulated DC power for I/O and analog control modules. It supports selectable 115/230 VAC operation and provides 8 A at +5 VDC and 600 mA at ±15 VDC, ensuring stable and reliable operation in industrial automation systems.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Honeywell |
| Category |
Industrial Power Supplies |
| Part Number |
621-9934 |
| Subcategory |
I/O Power Supply Modules |
| Function |
Power supply for I/O and analog modules |
| Input Voltage |
Selectable 115/230 VAC |
| Input Frequency |
47–63 Hz |
| Output Voltage |
+5 VDC and ±15 VDC |
| Output Current |
+5 VDC @ 8 A, ±15 VDC @ 600 mA |
| Input Terminals |
A (L1/Line), B (L2/Common), and Ground symbol |
| Power Output Type |
Regulated DC output |
| Power Capacity |
Total combined power for standard I/O operation |
| Operating Frequency Range |
46–63 Hz |
| Configuration |
Selectable input via internal switch or jumper |
| Protection |
Overload and thermal protection |
| Mounting |
Rack-mounted installation |
| Electrical Isolation |
Integrated between input and output |
| Housing |
Metal front coverplate with terminal block |
| Cooling |
Convection cooled |
| Operating Temperature |
0…55°C |
| Storage Temperature |
-25…+85°C |
| Relative Humidity |
95%, non-condensing |
| Applications |
I/O racks, analog modules, and control system power distribution |
| Weight |
3.20 lbs (approx. 1.45 kg) |
Information About 621-9934
The Honeywell 621-9934 belongs to the I/O power supply family used in Honeywell industrial control systems, designed to provide regulated DC power for I/O and analog signal modules. It operates on either 115 VAC or 230 VAC input, selectable through internal configuration, and converts it into +5 VDC and ±15 VDC outputs. The +5 VDC supply delivers up to 8 A for digital logic and I/O modules, while the ±15 VDC supply provides 600 mA for analog and special-function modules. A top-mounted terminal block clearly labels the AC input connections for line, common, and ground, simplifying installation. Built with overload and thermal protection, the 621-9934 ensures stable and safe power delivery within demanding automation environments.
Key Features:
- Selectable Input Voltage: Operates on either 115 VAC or 230 VAC, suitable for global installations.
- High Output Capacity: Supplies 8 A at +5 VDC and 600 mA at ±15 VDC to power I/O and analog modules.
- Stable Regulated Output: Provides consistent voltage regulation for sensitive control electronics.
- Integrated Protection: Includes overload and thermal protection to ensure operational safety.
- Durable Construction: Metal front coverplate and robust design for industrial reliability.
- Convenient Connection: Top-mounted terminal block simplifies AC wiring and installation.
- Rack-Mount Design: Fits Honeywell I/O racks, supporting centralized power distribution.
- Wide Frequency Range: Compatible with 47–63 Hz AC input for flexible operation.
The 621-9934 delivers the reliability and precision required for powering control modules and maintaining stable operation in Honeywell process automation systems.
