What is the difference between the different models of the GfA SI series? Industrial door motor selection guide

I. Introduction: Why do we need to know the difference between the SI series?

A logistics park 24-hour operation of the rapid rolling door, the motor works continuously for 3 months after frequent overheating shutdown. Site investigation found that: selection only considered the weight of the door body, ignored theStarts and stops per hour和environmental temperatureThe impact on the life of the motor. Another case: a food factory explosion-proof door selection of ordinary motors + external safety brake, brake response delay, the door fell nearly caused an accident - if the choice ofIntegrated motor with built-in safety brakeThe risk can be completely avoided.

The core technical features of the GfA ELEKTROMATEN SI Safedrive® series areBuilt-in patented safety brakeThe KE series is fundamentally different from the KE series, which requires an external safety brake.Suzhou Jufu Intelligent Equipment Technology Co., Ltd.GfA in Greater ChinaThe only official core partnerIn the past 10 years, we have been focusing on the sales, service and technical support of GfA products, and have helped hundreds of customers to complete accurate selection. This article helps you clarify the difference between the SI series models and the applicable scenarios.

Second, the 5 core dimensions of industrial fast door motor selection

Before comparing specific models, identify the key factors that need to be considered for selection:

Selection Dimension	key issue	Why it matters.
1. Output torque	Door weight × reel radius = required torque	Insufficient torque → overloaded motor burns out; too much torque → wasted costs
2. Output speed	Door height ÷ Desired opening time = Required speed	Speed affects the efficiency of passage, but too much can wear out the door body
3. Security functions	Is fall protection required? Explosion proof? Fire protection?	Safety standard EN 12453 mandatory and uncompromising
4. Frequency of use	Starts and stops per day/hour	High-frequency scenarios require better design for heat dissipation
5. Mounting space	Is the motor mounting position restricted	Compact motors (SIK) solve space challenges

Comparison table of all GfA SI Safedrive® series models

The core strengths of the GfA SI series areBuilt-in patented safety brakeThe brake is independent of speed and direction, maintenance-free, self-monitoring, and keeps the door from falling even when the worm gear fails. Suzhou Torchford has SI series core products in stock all year round and can respond quickly to customer needs.

Series/Model	Torque range	speed range	Safe braking	Adaptation of door types and differentiated selling points
SI 8.20 / 14.15 / 14.20	80-140 Nm	15-20 rpm	✅ Built-in	Light duty fast rolling doors, unbalanced sliding doors; entry level, cost effective
SIK 17.10 WS / 25.10 WS	170-250 Nm	10 rpm	✅ Built-in	Space-constrained roll-up doors;compact designHollow shaft alignment
SI 10.15 ~ SI 180.6	100-1800 Nm	6-15 rpm	✅ Built-in	Standard industrial doors, logistics centres; the main series with the widest coverage
SI 17.24 ~ SI 100.24 (Rapid Safedrive®)	170-1000 Nm	24-90 rpm	✅ Built-in	High-frequency fast-pass gates;fastestMaximum 90rpm
SI 10.70 ~ SI 28.46	100-280 Nm	46-90 rpm	✅ Built-in	Ultra-high-frequency pass gate; specialised for high speeds
SI 260.5 ~ SI 500.5 GH	2600-5000 Nm	5-9 rpm	✅ Built-in	Extra large heavy duty industrial doors;Super torqueGH Heavy Duty Series
SI FI series (with frequency converter)	35-1800 Nm	5-350 rpm	✅ Built-in	Scenarios that require soft start/stop and speed regulation;variable frequency controlEnergy efficient and smooth
SI ATEX Series	250-800 Nm	12-15 rpm	✅ Built-in	Explosive environments (chemical plants, dusty workshops);Ex certified

IV. Rapid Decision Guide for Model Differences

• Selection of speed: Fast Track → Rapid Safedrive® Series(up to 90 rpm); standard scenario → main series (6-24 rpm)
• Selection torque: Light load ≤140Nm → SI 8.20/14.15; Heavy load ≥2600Nm → SI 260.5 and above
• Selection of space: Restricted installation location → SIK Compact
• selective control: Requires soft start/stop, multispeed → SI FI Inverter Series
• Selection security: explosion-proof environment → SI ATEX Series

💡 Suzhou Torchford Technology TipsWhen selecting a model, you also need to consider the ambient temperature, the number of starts and stops per hour, and whether it is suitable for the TS971 controller. Our technical team has nearly 20 years of experience in the industry, and can provide free selection advice.

V. Selection decision-making flow chart

Customer request input
    ↓
Is fall protection required? ── No ──→ Consider KE series (external safety brake)
    ↓ Yes
Is explosion protection required? ── Yes ─→ SI ATEX explosion-proof series
    ↓ No
Restricted installation space? ── Yes ─→ SIK Compact Series
    ↓ No
Is a high frequency fast pass (>24rpm) required? ── Yes ─→ Rapid Safedrive® Series
    ↓ No
Standard industrial door scenarios → Selection by torque:
    - <140nm → si 8.2014.15
 • 140-1000nm si主力系列
>1000Nm → SI heavy duty series
    ↓
Do you need soft start/stop/speed control? ── Yes ── → SI FI inverter series
    ↓ No
Determine the model → Contact Suzhou Torchford for quotation and technical support.
  

VI. Application Scenario Correspondence Table

Applications	Recommended Models	Recommended Reasons
Factory Logistics Corridor	SI 25.15 / SI 40.15	Moderate torque, reliable speed, suitable for conventional sliding doors
Cold Chain Warehouse Rapid Doors	SI 17.60 FI	Frequency conversion control, soft start/stop to reduce door shock
Car park entrance/exit	SI 25.24 Rapid	Quick 24rpm response to reduce vehicle waiting
clean room	SIK 17.10 WS	Compact design with fewer dust spots
chemical explosion proof area	SI 25.15 Ex / SI 40.15 Ex	ATEX approved, Ex-e/Ex-de double protection
Mega Logistics Centre	SI 260.5 / SI 360.5	High torque for extra-wide and extra-high doors.

VII. Why is the GfA SI series more reliable? Comparison table

comparison dimension	General industrial door motors	GfA SI Safedrive®
Safe braking method	External electromagnetic brake	Built-in patented safety brake (integrated in the worm gear)
Principle of fall protection	Motor-dependent power failure braking	Mechanical locking in case of worm gear/worm failure
Brake Response Time	50-100ms	<20ms
Maintenance cycle	Check brakes every 6 months	Maintenance-free, self-monitoring
Certification Standards	Basic CE	TÜV Nord certification + ift Rosenheim certificate

VIII. FAQs - 6 issues of greatest concern to customers

IX. About Suzhou Torchford Intelligent Equipment Technology Co.

Suzhou Torchford Intelligent Equipment Technology Co., Ltd. is a subsidiary of GfA ELEKTROMATEN in Greater China.The only official core partnerGfA has been focusing on sales, service and technical support of GfA in Greater China for nearly 10 years. In order to quickly respond to market demand, the company always has GfA core products in stock, including TS971/TS981 controllers, SE 9.24 sliding door operators, SI series safety motors and so on.

At the same time, the company is also the authorised agent of Swiss BBC BIRCHER sensors, and independently develops and produces wireless anti-pinch, wired anti-pinch, standard radar and other sensors, as the main sales channel of domestic high-end sensors GIANTS brand. Suzhou Torchford always “drive | control | safety | sensing” as the core, for your safe and efficient operation of the entrance and exit escort.

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