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3LD2766-1GP51
Siemens 3LD2766-1GP51 available at EU Automation. Get in touch today for a quick price.
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What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
The Siemens 3LD2766-1GP51 is a SENTRON 3LD switch disconnector designed for main switch, isolation and maintenance applications in industrial electrical installations. This 3-pole unit is rated at 100 A with a 690 V AC insulation and operating voltage, making it suitable for controlling and isolating power circuits in machinery, control panels and distribution equipment.
Housed in a moulded-plastic enclosure with metric threaded cable entry, the 3LD2766-1GP51 features a black rotary operating mechanism with clear 1 ON / 0 OFF position indication. Its IP65 protection rating supports use in demanding environments where resistance to dust and water ingress is required. The device includes 1 normally open and 1 normally closed auxiliary contact, enabling integration with control and signalling circuits.
With an AC-23A operating power rating of 37 kW at 400 V and 30 kW at 690 V, this switch disconnector is well suited to motor and load switching duties. It offers a typical mechanical service life of 100,000 operating cycles and can be locked in the OFF position using padlocks, helping to support controlled isolation during maintenance procedures. The unit measures 302 mm high, 212 mm wide and 181 mm deep, with box terminals for the main circuit and terminal connections for auxiliary contacts.
Housed in a moulded-plastic enclosure with metric threaded cable entry, the 3LD2766-1GP51 features a black rotary operating mechanism with clear 1 ON / 0 OFF position indication. Its IP65 protection rating supports use in demanding environments where resistance to dust and water ingress is required. The device includes 1 normally open and 1 normally closed auxiliary contact, enabling integration with control and signalling circuits.
With an AC-23A operating power rating of 37 kW at 400 V and 30 kW at 690 V, this switch disconnector is well suited to motor and load switching duties. It offers a typical mechanical service life of 100,000 operating cycles and can be locked in the OFF position using padlocks, helping to support controlled isolation during maintenance procedures. The unit measures 302 mm high, 212 mm wide and 181 mm deep, with box terminals for the main circuit and terminal connections for auxiliary contacts.
| Specification | Description |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3LD2766-1GP51 |
| Series | SENTRON 3LD |
| Product Type | Switch disconnector |
| Function | Main switch for isolating electrical circuits in industrial control and power applications |
| Pole Configuration | 3-pole |
| Rated Continuous Current | 100 A |
| Rated Operating Voltage | 690 V AC |
| Rated Insulation Voltage | 690 V |
| Rated Surge Voltage Resistance | 6 kV |
| Utilisation Category Rating | AC-21 and AC-23A operation |
| Operating Power at AC-23A, 400 V | 37 kW |
| Operating Power at AC-23A, 690 V | 30 kW |
| Operating Power at AC-3, 400 V | 30 kW |
| Operating Power at AC-3, 690 V | 22 kW |
| Conditional Short-Circuit Current | 50 kA at 690 V with line-side gG fuse protection |
| Required Main Circuit Fuse | gL/gG 100 A |
| Required Auxiliary Switch Fuse | gL/gG 10 A |
| Auxiliary Contacts | 1 normally open and 1 normally closed contact |
| Auxiliary Contact Rated Current | 10 A |
| Auxiliary Contact Maximum Voltage | 500 V AC |
| Actuator Type | Short black rotary knob |
| Switch Position Indication | Manual 1 ON / 0 OFF indication |
| Enclosure Type | Moulded-plastic enclosure with metric threaded connection |
| Ingress Protection | IP65 |
| NEMA Rating | NEMA 1, 4X and 12 |
| Locking Feature | Lockable in the OFF position with up to 3 bracket locks |
| Padlock Hasp Thickness | 4 mm to 8 mm |
| Mechanical Service Life | 100,000 operating cycles |
| Electrical Endurance | 6,000 operating cycles at AC-23A, 690 V |
| Maximum Operating Frequency | 50 operations per hour |
| Power Loss | 7.5 W per pole at rated current |
| Mounting Style | Fixed mounting as a complete enclosed unit |
| Main Circuit Connection | Box terminal |
| Auxiliary Contact Connection | Connection terminals |
| Main Conductor Cross-Section | Solid or stranded copper conductor from 4 mm² to 50 mm² |
| Finely Stranded Main Conductor Cross-Section | Up to 35 mm² with core end processing |
| Auxiliary Conductor Cross-Section | 0.75 mm² to 4 mm² depending on conductor type and auxiliary switch position |
| Ambient Operating Temperature | -25 °C to +55 °C |
| Dimensions | 302 mm high x 212 mm wide x 181 mm deep |
| Approximate Net Weight | 1.815 kg |
| Typical Applications | Electrical isolation, machine control panels, motor circuit isolation and industrial plant switching |
What type of electrical component is this?
It is a Siemens SENTRON 3LD switch disconnector designed for use as a main switch or isolating switch in industrial electrical panels and machinery circuits.
What current rating does this switch disconnector have?
The unit is rated for 100 A operational current, making it suitable for higher-current industrial isolation applications within its specified voltage and utilisation categories.
What voltage is it rated for?
The switch disconnector has a rated insulation voltage of 690 V AC and is intended for 50/60 Hz AC applications.
How many poles does this device have?
It is a 3-pole switch disconnector, intended for switching three-phase circuits.
What enclosure protection rating does it offer?
The device is supplied in a moulded-plastic enclosure with an IP65 rating, providing protection against dust ingress and low-pressure water jets when correctly installed.
What is the switching power rating at 400 V?
At AC-23A and 400 V, the switch disconnector is rated for 37 kW. Under AC-3 at 400 V, it is rated for 30 kW.
Does it include auxiliary contacts?
Yes. This model includes 1 normally open auxiliary contact and 1 normally closed auxiliary contact, each with a rated continuous current of 10 A.
Can the switch be locked in the OFF position?
Yes. The actuator can be locked in the OFF position and accepts up to 3 padlocks with a hasp thickness of 4 to 8 mm.
What are the approximate dimensions?
The unit measures approximately 212 mm wide, 302 mm high and 181 mm deep.
What type of operating handle does it use?
It uses a black rotary operating mechanism with a short rotary knob and a clear manual 1 ON / 0 OFF switching indication.
What short-circuit protection is specified for the main circuit?
The main circuit requires a gL/gG 100 A fuse for short-circuit protection. With line-side gG fuse protection, the conditional short-circuit current rating is 50 kA at 690 V.
What conductor sizes can be connected to the main terminals?
For copper conductors, the main terminals accept solid or stranded conductors from 4 to 50 mm², or finely stranded conductors with core end processing up to 35 mm².
What ambient temperature range is specified for operation?
The specified operating temperature range is -25 °C to +55 °C.
Is it suitable for use as an emergency stop switch?
No. Although 3LD2766-1GP51 is suitable as a main switch, switch disconnector and maintenance isolator, it is not designated as an emergency stop switch.
- Main isolation of three-phase machinery and control panels
- Disconnecting power to industrial motors during planned maintenance
- Switching and isolating AC loads in manufacturing equipment
- Use as a lockable main switch in enclosed electrical assemblies
- Power isolation for pumps, fans, compressors and conveyor systems
- Local isolation on machine tools and production line equipment
- Control cabinet incoming supply disconnection
- Isolation of motor circuits rated for AC-23A duty
- Panel-mounted switching in industrial automation installations
- Electrical separation of equipment during inspection or servicing
This content has been produced using multiple sources. EU Automation takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
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Customer reviews
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Tom Higgins did a great job at getting us the part we needed. He saw a concern with the part a verified before shipping.
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