Huba Control Differential Pressure Switch

 

Model: Type 604

Part Number: 604.9010000

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1. General Description

 

The Huba Control Type 604 is a differential pressure switch designed for monitoring overpressure, underpressure (vacuum), and differential pressure of air and other non-aggressive gases. It is commonly used in HVAC, ventilation, and air conditioning systems to monitor air filters, fans, and airflow status.

This device operates as a simple mechanical switch. When the measured pressure difference reaches the user-adjusted setpoint, an internal SPDT (Single Pole Double Throw) micro-switch is actuated, providing a simple on/off signal for a control system, fan, or indicator light.

Key Features 🎯

 

• For Air & Non-Aggressive Gases: Designed specifically for HVAC and pneumatic applications.

• Adjustable Setpoint: The switching pressure is user-adjustable via a dial, in this case, from 20 to 300 Pa.

• High Reliability: Simple, robust mechanical design ensures a long service life.

• SPDT Switch: Provides a changeover contact (Normally Open and Normally Closed) for flexible wiring.

• High Overpressure Protection: Can withstand a maximum pressure of 5000 Pa (50 mbar).

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2. Technical Specifications

 

Performance & Operating Data

 

Parameter	Value
Adjustable Range	20 … 300 Pa
P max (Max. Overpressure)	5000 Pa
P min (Max. Vacuum)	-5000 Pa
Medium	Air and non-aggressive gases

Electrical Data (from label)

 

Parameter	Value
Contact Type	SPDT (Single Pole Double Throw) Micro-switch
Rating (Resistive Load)	0.8 A at 250 VAC
Rating (Inductive Load)	0.5 A (0.7A) at 250 VAC
Connection	3-pin AMP terminals

Mechanical & Environmental Data

 

Parameter	Value
Pressure Connections	2x plastic tubes for differential pressure
Housing Material	Plastic
Protection Class	IP54 (when installed correctly)
Country of Origin	Switzerland

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3. Wiring (Standard SPDT)

 

This switch provides a changeover contact with three terminals.

• Pin 1 (COM): Common (Input)

• Pin 2 (NC): Normally Closed (Closed when pressure is below setpoint)

• Pin 3 (NO): Normally Open (Open when pressure is below setpoint)

Operation:

• When the pressure is low (OFF state), the circuit between Pin 1 (COM) and Pin 2 (NC) is closed.

• When the pressure rises and reaches the setpoint, the switch actuates. The circuit between Pin 1 (COM) and Pin 2 (NC) opens, and the circuit between Pin 1 (COM) and Pin 3 (NO) closes.

Datasheet

NORGREN Electronic 0880300 Pressure Switch

Digital Pressure Switch range from -0.1 to 1.0 MPa.