Area of Application

The ISOSTOP systems are generally characterized by a slim design. This makes transport and installation in high alpine terrain much easier. They are an effective and efficient system used to protect life, infrastructure and other elements at risk. ISOSTOP 1:1 scale tested carrying both European and Swiss certifications.

Rope Guidances

The upper and lower bearing ropes are led through a rope guidance that is integrated on each post head and base plate. Each guidance provides large curved surfaces to help protect the ropes and allow unobstructed movement. The guidance is designed to be robust and with no movable parts in order to ensure longevity and zero maintenance.

Integrated Ladder

Posts from this ISOSTOP system are built from RHP profiles that provide high torsional rigidity and extremely low weight. The detachable steps are installed after transport and enable the highest level of work safety.

Base Plate

The universal base plates of the ISOSTOP systems can be used for compression-tension anchoring, as well as for placement on foundations or walls. The unique mounting bolt enables free-standing installation of the posts, which saves significant time, especially when assembling a helicopter.

ISOROD Brake Element

The ISOROD forms the core element of the 3000 and 5000 kJ ISOSTOP systems and is based on the same principals as the ISODISK. Due to its compact installation length, it only requires a small distance between the post and the lateral anchor and its low weight makes it easier to install, especially on steep terrain.
ModelISOSTOP 3000 Evo
StyleHinged System
Energy Class6
Maximum Energy Level Certified/Tested [kJ]3000 / 3066
(1106 / 1131)
Service Energy Level Certified/Tested [kJ]1000
Approved Heights [m (ft)]5.0 - 6.0
(16.4 - 19.7)
VerificationFull Scale Tested
CertificationETAG 27 Certified
Test Report Summary
European Technical Assessment ETA
Test Height [m (ft)]5.0
Maximum Elongation [m (ft)]7.68
Residual Height ClassA (≥50%)
Component FailureNone
Primary Net Opening [m (ft)]2.16
Secondary MeshNone
ETA NumberETA-22/0861
Issuing BodyTSUS Building Testing and Research Institute
Date of IssueJanuary 17, 2023
Certificate of Conformity
Report Number1301-CPR-2136
Issuing BodyTSUS Building Testing and Research Institute
Date of IssueMarch 3, 2023
Primary Net
ModelRN 350/3/4
TypeRing Net
Points of Contact4
Single Wire Diameter [mm]3
Corrosion ProtectionZn or ZnAl (Class A or B)
Arc Diameter [mm (inch)]350
Unit Weight [kg/m2 (lb/ft2)]9.85
Mesh Tensile Strength calculated [kN/m (lbf/ft)] n/a
Connection to Main RopesThreaded
Connection to Adjacent Panel5/8" Shackle
Ring Net

The 4:1 Ring Net is a lighter, more flexible ring net that provides stopping power balanced with ease of installation.

Bearing Ropes
Quantity per fence segment4
Rope Diameter [mm (inch)]24
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Elements per rope1
Brake Element ModelISOROD 200
Middle Ropes
Quantity per fence segment3
Rope Diameter [mm (inch)]20
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Elements per rope2
Brake Element ModelISORDO 150
Retaining Ropes
Quantity per fence segment2
Rope Diameter [mm (inch)]24
Corrosion ProtectionZn or ZnAl (Class A or B)
Brake Elements per ropen/a
Brake Element Modeln/a
Support Structure
Post TypeRHS 250/150/6.3
Integrated LadderDetachable
Rope GuidesIntegrated
Post Weight as tested [kg (lbs)]240
Base Plate ConnectionTongue and Pin
Base Plate Foot Print [mm (in.)]800 x 410
(31 x 16)
Base Plate Weight [kg (lbs)]54
Anchors per base plate2 / 4
Post Base Support
1.Post; 2.Rope Guide; 3.Base Plate; 4.Hinge Pin; 5.Anchor; 6.Bolt
Retaining Rope Anchorage
1.Retaining Rope; 2.Anchor Eye; 3.Anchor
Lateral Anchorage
1.Side Stabilization Rope; 2.Upper Bearing Rope; 3.Lower Bearing Rope; 4.Middle Rope; 5.Brake Element; 6.Anchor Eye; 7.Anchor
Anchor Forces
Base Plate Tension (Loose Ground) FLGA,ten [kN (kips)] 272
Base Plate Compression (Loose Ground) FLGA,pres [kN (kips)] 192
Base Plate Shear (Rock/Foundation) FMF,shear [kN (kips)] 48
Lateral Anchor A Fk,lat,A [kN (kips)] 277
Lateral Anchor B Fk,lat,B [kN (kips)] 206
Lateral Anchor C Fk,lat,C [kN (kips)] 272
Retaining Rope Anchor Fk,ret [kN (kips)] 292
Typical Recommended Anchors Based on Steel Grade
Anchor PositionQuantity per 50 m 10 m post spacing500/550 MPa (e.g. GEWI)670/800 MPa (e.g. GEWI Plus)min 470 MPa (e.g. IBO)
Base Plate12 / 242522n/a
Lateral2 / 42522R32-280
Typical Cross Section
1.Post; 2.Vertical Rope; 3.Rope Guide; 4.Base Plate; 5.Ring Net; 6.Retaining Rope; 7.Anchor Eye; 8.Retaining Anchor; 9.Anchor
Typical Layout
1.Post; 2.Upper Bearing Rope; 3.Lower Bearing Rope; 4.Middle Ropes; 5.Retaining Rope; 6.Side Stabilization Rope; 7. Retaining Anchor; 8.Lateral Anchor