Description
Heavy Duty Non-Fusible Safety Switch
ABB Heavy Duty Non-Fusible Safety Switches are designed for demanding commercial and industrial disconnect applications where a rugged disconnecting means is required without integral fuse protection. This product family includes 30A, 60A, 100A, and 200A three-pole configurations with indoor NEMA 1 and outdoor NEMA 3R enclosures.
All listed models use a 3-pole non-fusible configuration. Because the switches do not contain fuses, required overcurrent protection must be provided separately by the electrical system.
Product Highlights
- ABB Heavy Duty safety switch family
- Non-fusible disconnect-switch construction
- 3-pole configurations
- 30A, 60A, 100A, and 200A options
- NEMA 1 indoor configurations
- NEMA 3R outdoor configurations
- Designed for demanding commercial and industrial applications
- Provides equipment isolation without integral fuses
- Seven catalog-number options
- Verify conductor, voltage, enclosure, and equipment requirements before ordering
Technical Specifications
| Manufacturer | ABB |
|---|---|
| Product Category | Heavy Duty Safety Switch |
| Switch Type | Non-Fusible |
| Number of Poles | 3 |
| Available Ampere Ratings | 30A, 60A, 100A, 200A |
| Available Enclosure Types | NEMA 1 Indoor, NEMA 3R Outdoor |
| Primary Function | Electrical Equipment Disconnect / Isolation |
| Overcurrent Protection | Not Integral - Provided Separately |
| Available Catalog Numbers | THN3361, THN3361R, THN3362, THN3362R, THN3363, THN3363R, THN3364 |
Construction Details
ABB Heavy Duty non-fusible safety switches are designed for compatible commercial and industrial electrical systems requiring a durable means of disconnecting equipment from its power source.
The switches listed here use three-pole construction and are available in indoor NEMA 1 and outdoor NEMA 3R enclosure configurations depending on catalog number.
Because these models are non-fusible, they provide switching and isolation only. Required circuit overcurrent protection must be supplied elsewhere in the electrical system.
Available Heavy Duty Safety Switches
Catalog Number & Configuration
| Catalog Number | Ampere Rating | Poles | Enclosure |
|---|---|---|---|
| THN3361 | 30A | 3 | NEMA 1 |
| THN3361R | 30A | 3 | NEMA 3R |
| THN3362 | 60A | 3 | NEMA 1 |
| THN3362R | 60A | 3 | NEMA 3R |
| THN3363 | 100A | 3 | NEMA 1 |
| THN3363R | 100A | 3 | NEMA 3R |
| THN3364 | 200A | 3 | NEMA 1 |
Selecting the Correct Safety Switch
30A Models
Select THN3361 for the 30A NEMA 1 indoor configuration or THN3361R for the corresponding NEMA 3R outdoor configuration.
60A Models
Select THN3362 for the 60A NEMA 1 indoor configuration or THN3362R for the corresponding NEMA 3R outdoor configuration.
100A Models
Select THN3363 for the 100A NEMA 1 indoor configuration or THN3363R for the corresponding NEMA 3R outdoor configuration.
200A Model
Select THN3364 for the listed 200A, 3-pole, NEMA 1 indoor configuration.
Non-Fusible Heavy Duty Design
These THN-series safety switches are non-fusible. They provide a means of disconnecting compatible electrical equipment but do not incorporate fuses into the switch assembly.
Required overcurrent protection must be provided by an appropriately rated upstream circuit breaker, fuse, or other approved protective device.
NEMA 1 vs. NEMA 3R
NEMA 1 Indoor
THN3361, THN3362, THN3363, and THN3364 are the indoor NEMA 1 configurations supplied in this product group.
NEMA 3R Outdoor
THN3361R, THN3362R, and THN3363R are the outdoor NEMA 3R configurations supplied in this product group.
Heavy Duty Applications
Commercial Applications
- Building electrical systems
- Mechanical equipment disconnects
- Commercial HVAC equipment
- Service and maintenance isolation
- Electrical distribution equipment
Industrial Applications
- Industrial machinery
- Motor disconnect applications
- Manufacturing equipment
- Processing equipment
- Equipment isolation systems
- Industrial electrical distribution
Installation & Selection Considerations
- Confirm the required 30A, 60A, 100A, or 200A rating.
- Verify that a 3-pole non-fusible safety switch is appropriate for the application.
- Select NEMA 1 for compatible indoor installations.
- Select NEMA 3R for compatible outdoor installations.
- Verify the system voltage against the exact switch rating.
- Provide required overcurrent protection separately.
- Confirm conductor material and size requirements.
- Verify motor and equipment requirements where applicable.
- Maintain NEMA 3R enclosure integrity on outdoor models.
- Follow ABB terminal and conductor requirements.
- Maintain applicable electrical working clearances.
- De-energize equipment before installation or service.
- Verify absence of voltage before working on electrical equipment.
- Installation and service should be performed by qualified electrical personnel.
- Follow current ABB instructions and applicable electrical codes.
Product Documents
Review the ABB Heavy Duty Non-Fusible Safety Switch combined specifications for catalog-specific ampere ratings, enclosure types, electrical ratings, conductor requirements, horsepower information, dimensions, listings, and manufacturer guidance.
Need Help Selecting a Heavy Duty Safety Switch?
Our electrical and industrial product specialists can help review your ampere rating, system voltage, pole configuration, conductor requirements, equipment load, overcurrent protection, and indoor or outdoor enclosure requirements before you order.
Frequently Asked Questions
Are these safety switches fusible?
No. These THN-series models are non-fusible Heavy Duty safety switches.
How many poles do these switches have?
All seven models listed here use a three-pole configuration.
What ampere ratings are available?
Available ratings are 30A, 60A, 100A, and 200A.
What is THN3361?
THN3361 is the 30A, 3-pole, NEMA 1 indoor configuration.
What is THN3361R?
THN3361R is the 30A, 3-pole, NEMA 3R outdoor configuration.
What is THN3362?
THN3362 is the 60A, 3-pole, NEMA 1 indoor configuration.
What is THN3362R?
THN3362R is the 60A, 3-pole, NEMA 3R outdoor configuration.
What is THN3363?
THN3363 is the 100A, 3-pole, NEMA 1 indoor configuration.
What is THN3363R?
THN3363R is the 100A, 3-pole, NEMA 3R outdoor configuration.
What is THN3364?
THN3364 is the 200A, 3-pole, NEMA 1 indoor configuration.
Does a non-fusible switch provide overcurrent protection?
No. Required overcurrent protection must be provided elsewhere in the electrical system.
Where can I review ABB's specifications?
The ABB Heavy Duty Non-Fusible Safety Switch Specifications PDF is linked in the Product Documents section above.
Important Ordering & Installation Notes
- Product: Heavy Duty Non-Fusible Safety Switch.
- THN3361: 30A | 3 Pole | NEMA 1.
- THN3361R: 30A | 3 Pole | NEMA 3R.
- THN3362: 60A | 3 Pole | NEMA 1.
- THN3362R: 60A | 3 Pole | NEMA 3R.
- THN3363: 100A | 3 Pole | NEMA 1.
- THN3363R: 100A | 3 Pole | NEMA 3R.
- THN3364: 200A | 3 Pole | NEMA 1.
- Switch type: Non-Fusible.
- Number of poles: 3.
- Indoor enclosure: NEMA 1.
- Outdoor enclosure: NEMA 3R.
- Required overcurrent protection must be provided separately.
- Confirm voltage, conductor, load, and equipment requirements before ordering.
- Maintain NEMA 3R enclosure integrity on outdoor models.
- De-energize equipment before installation or service.
- Installation should be performed by qualified electrical personnel.
- Follow current ABB instructions and applicable electrical codes.
