Temperature Controller

SH3B21 Digital Temperature Controller

Introduction

Introduction

Product General Information:

Place of Origin:	Xuzhou,china
Brand Name:	SHTROL
Model Number:	SH3B21
Certification:	CE\CCC\ISO9001

Product Business Terms：

Minimum Order Quantity:	1000
Price:	$8
Packaging Details:	carton
Delivery Time:	15-32days
Payment Terms:	TT

The SH3B21 is an intelligent small-size temperature controller designed by Weite for normal temperature bottle coolers, refrigerated cabinets, tables and pizza counters. Featuring high-precision PTC/NTC temperature sensors, it accurately monitors and controls cabinet temperature to ensure beverages are stored at optimal conditions with stable taste. The built-in Energy Saving strategy intelligently optimizes compressor operation to reduce energy consumption and lower operating costs.

The product features a compact 78×36×37mm design with panel snap-in installation, suitable for various small refrigeration equipment modifications. The front panel meets IP65 protection rating, dust and water resistant, suitable for humid commercial environments. Equipped with multiple status LEDs (compressor, defrost, energy saving, on/off), providing clear operation status at a glance. Supports door alarm (id), temperature alarms (AL/AH), probe fault (Pr1), pressure switch alarm (iA) and other protective functions. Auto keyboard lock after 30 seconds of inactivity prevents misoperation. Ideal for beverage display cabinets, convenience store coolers, and supermarket refrigerated cabinets.

Parameter	Value	Description
Model	SH3B21	Small basic controller for normal temperature bottle coolers
Product Type	Normal Temp Controller	For normal temperature bottle coolers
Dimensions	78×36×37 mm	Compact small size, saves installation space
Mounting	Panel Snap-in	Panel thickness 0.8~2.0mm
Protection Rating	IP65	Front panel dust & water resistant
Operating Temp	0 ~ 55°C	Wide operating temperature range
Storage Temp	-25 ~ 70°C	Suitable for various storage environments
Humidity	10~90% RH	Non-condensing
Power Supply	230VAC (+10%/-15%)	50/60Hz
Power Consumption	2VA	Low power design

Parameter	Value	Description
Temperature Sensor	PTC / NTC	PTC (990Ω@25°C) or NTC (10KΩ)
Temperature Unit	°C / °F	Switchable via parameter
Temperature Setting	Adjustable	Set via r1/r2 parameters
Defrost Type	Electric/Hot Gas	Configurable via parameters
Energy Saving	Energy Saving	Smart energy strategy, reduces operating costs
Keyboard Lock	Supported	Auto lock after 30s inactivity

Precision Temperature Control:Equipped with high-precision PTC/NTC temperature sensor, real-time accurate monitoring of cabinet temperature, intelligent compressor control ensures beverages are stored at optimal temperature with consistent taste.

Energy SavingStrategy: Built-in intelligent Energy Saving algorithm, automatically optimizes compressor runtime and frequency, significantly reduces energy consumption, helps merchants effectively control operating costs and improve competitiveness.

Compact Small Design: Only 78×36×37mm compact size, fits various small refrigeration equipment, saves installation space, easy for modification or replacement in limited spaces.

IP65 ProtectionRating:Front panel meets IP65 dust & water proof standard, effectively resists humid environments and condensation, suitable for beverage display cabinets and commercial refrigeration scenarios.

Door Alarm Function:Supports door switch alarm (id), real-time monitoring of cabinet door status, timely alarm when abnormal door opening to prevent cold air loss and energy waste.

Multi Protection Mechanism: Equipped with temperature alarms (AL/AH), probe fault (Pr1), pressure switch alarm (iA) and other multiple protections, ensures safe and stable equipment operation.

Intuitive LED Status Display: Equipped with compressor, defrost, energy saving, on/off LED indicators, operational status at a glance, easy equipment maintenance.

Keyboard Security Lock: Auto keyboard lock after 30s of inactivity prevents misoperation; long press 1s to unlock, safe and convenient, suitable for public places.