Sensors
Reliable sensing solutions for HVAC and building automation systems. Monitor current, pressure, and environmental conditions with precision Schneider Electric components.
Current Switches
Schneider Electric current-sensing switches for HVAC fan and pump status monitoring. Adjustable trip points for flexible field installation in commercial building automation systems.
| Model | Type | Housing | Range (AC) | Output | Notes | |
|---|---|---|---|---|---|---|
| H921 | Transducer | Split-Core | 0–30 / 60 / 120 A | 4–20 mA | Field-selectable, UL Listed | Request Quote → |
| H922 | Transducer | Split-Core | 0–30 / 60 / 120 A | 0–5 VDC | Field-selectable, UL Listed | Request Quote → |
| H923 | Transducer | Split-Core | 0–30 / 60 / 120 A | 0–10 VDC | Field-selectable, CE & UL | Request Quote → |
| H308 | Switch | Micro Split-Core | 0.75–50 A | N.O. 1A @ 30VAC/DC | Min trip 0.75A, UL & CE, no LED | Request Quote → |
| H608 | Switch | Mini Split-Core | 0.5–175 A | N.O. 1A @ 30VAC/DC | Min trip 0.5A, status LED, UL & CE | Request Quote → |
| H908 | Switch | Split-Core | 2.5–135 A | N.O. 1A @ 30VAC/DC | Min trip 2.5A, status LED, UL & CE | Request Quote → |
| H958 | Switch/Relay | Split-Core | 2.5–135 A | N.O. SPST, 12VDC Coil | Switch + relay combo, UL & CE | Request Quote → |
Frequently Asked Questions
What is the difference between a current transducer and a current switch?
A current transducer (H921/H922/H923) outputs an analog signal (4–20 mA or 0–10 VDC) proportional to the measured current — useful for monitoring load levels. A current switch (H308/H608/H908/H958) outputs a simple relay contact that opens or closes at a set trip point — used for proving fan or pump operation.
How do I select the right current switch for my application?
Consider the conductor size and current range first. The H308 suits micro split-core installations up to 50A, the H608 handles up to 175A with a status LED, and the H908/H958 are for larger split-core installations up to 135A. The H958 adds a relay coil output for applications needing both switch and relay action.
Can these current switches be used for fan proving in AHUs?
Yes. The H608 and H908 are commonly used for fan proving in air handling units. The adjustable trip point allows field calibration to the specific motor load.
Pressure Switches
Precision pressure-sensing switches for airflow monitoring and system protection in commercial HVAC applications. Ideal for filter status, duct pressure, and fan proving installations.
| Model | Pressure Range | Contact Type | Voltage | Reset | Notes | |
|---|---|---|---|---|---|---|
| KEL-AFS-460-137 | 0.40–12" WC | DPDT | 24 VAC | Manual | Airflow proving, energy mgmt | Request Quote → |
Frequently Asked Questions
What does a differential pressure switch do in an HVAC system?
It monitors the pressure difference across two points — typically across a filter or fan — and triggers a relay contact when that difference exceeds a set threshold. Common uses include filter change alerts, fan proving, and duct static pressure protection.
What does DPDT mean on the KEL-AFS-460-137?
DPDT stands for Double Pole Double Throw. It provides two independent switch contacts that change state simultaneously, giving more wiring flexibility for control or alarm circuits.
Why does this pressure switch require manual reset?
Manual reset ensures an operator physically acknowledges and clears the fault condition before the system restarts. This is standard practice for safety-critical airflow proving applications where automatic restart could mask an unresolved issue.
Living Space Sensors
Room-level environmental monitoring for temperature, humidity, and CO2. Designed for occupied spaces with sleek, unobtrusive aesthetics.
| Model | Type | Measurements | Protocol / Output | Notes | |
|---|---|---|---|---|---|
| SLASXX2 | Humidity & Temperature Sensor | Temperature, Humidity | Analog 0–10V / 0–5V | Low-profile, analog output | Request Quote → |
| SLASXXX | Temperature Sensor | Temperature | 10K T3 Thermistor | Resistive output, no communications | Request Quote → |
| SLP-Series | Air Quality Sensor | Temperature, Humidity, CO2, VOC, PM (configuration dependent) | BACnet MS/TP, Modbus RTU | 60+ configurations, setpoint & override options | Request Quote → |
Frequently Asked Questions
What is the difference between SLASXX2 and SLASXXX?
The SLASXX2 measures temperature and humidity. The SLASXXX adds CO2 sensing for demand-controlled ventilation and indoor air quality monitoring.
What communication protocols do SLP Series sensors support?
BACnet MS/TP, Modbus RTU, and analog outputs (0-10V, 4-20mA) for integration with most building automation systems.
Can I get a specific SLP variant not listed here?
Yes. As an authorized distributor we can source any SLP configuration. Submit a quote request with your part number or specs.
Need a different sensor?
We can source any Schneider Electric sensor. Submit a quote request with your part number.
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